New Accounting Pronouncements Accounts Receivable, Net, Current Accounts receivable, net of allowance for doubtful accounts of $991 at March 31, 2011 and $742 at December 31, 2010 Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income (loss) income Payments to Acquire Businesses and Interest in Affiliates Payments to Acquire Businesses, Net of Cash Acquired Business acquisition, net of cash acquired Allowance for Doubtful Accounts Receivable, Current Accounts receivable, allowance for doubtful accounts (in dollars) Condensed Consolidated Balance Sheets Cash, cash equivalents and investment securities Cash, Cash Equivalents, and Short-term Investments Cash, cash equivalents and investment securities Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents CASH AND CASH EQUIVALENTS, end of period CASH AND CASH EQUIVALENTS, beginning of period Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid, Deferred Expense and Other Assets Prepaid expenses and other assets Cash provided (used) by changes in operating assets and liabilities, net of assets acquired Increase (Decrease) in Operating Capital [Abstract] Increase (Decrease) in Accounts Payable Accounts payable Increase (Decrease) in Accrued Liabilities Accrued liabilities Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies: Common Stock, Shares Authorized Common stock, Authorized shares Common Stock, Shares, Outstanding BALANCE, shares - end of year BALANCE, shares - beginning of year Common stock, outstanding shares Common Stock, Value, Issued Common stock, $0.10 par value - Authorized-80,000 shares; Issued 14,855 shares at March 31, 2011 and December 31, 2010, outstanding 13,732 shares at March 31, 2011 and 13,659 shares at December 31, 2010 Comprehensive Income, Net of Tax, Attributable to Parent Comprehensive income Cost of Goods Sold COST OF GOODS SOLD CURRENT LIABILITIES: Liabilities, Current [Abstract] Liabilities, Current Total current liabilities Earnings Per Share, Diluted Diluted (in dollars per share) Consolidation, Policy [Text Block] Basis of Presentation: Effect of Exchange Rate on Cash and Cash Equivalents Effect of exchange rate changes on cash Share-based Compensation Stock compensation Gain on sale of building Gain (Loss) on Sale of Property Plant Equipment Loss on disposal of property and equipment Gross profit [Abstract] Gross Profit Gross profit Condensed Consolidated Statements of Income Income Tax Disclosure [Text Block] Income Taxes: Income Taxes Paid, Net Cash paid during the year for income taxes Increase (Decrease) in Restricted Cash Change in restricted cash Intangible Assets, Net (Excluding Goodwill) INTANGIBLE ASSETS, net Inventory, Net Inventories Investment Securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Stockholders' Equity [Abstract] Liabilities and Stockholders' Equity TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY Available-for-sale Securities, Noncurrent INVESTMENT SECURITIES Available-for-sale Securities, Current Investment securities MINORITY INTEREST Minority interest CASH FLOWS FROM FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Net Cash Provided by (Used in) Financing Activities Net cash provided (used) by financing activities CASH FLOWS FROM INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Net Cash Provided by (Used in) Investing Activities Net cash provided (used) by investing activities CASH FLOWS FROM OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Cash and Cash Equivalents, Period Increase (Decrease) NET DECREASE IN CASH AND CASH EQUIVALENTS Proceeds from Stock Plans Proceeds from employee stock purchase plan Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Text Block] New Accounting Pronouncements: Nonoperating Income (Expense) [Abstract] Nonoperating Income (Expense) OTHER INCOME Income from operations Operating Income (Loss) Income from operations REVENUES: Revenues [Abstract] Revenues TOTAL REVENUE Other comprehensive income (loss), net of tax of $176 and $1,110 for the three months ended March 31, 2011 and 2010, respectively: Other Comprehensive Income (Loss), Net of Tax [Abstract] Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Unrealized loss on investments Preferred Stock, Shares Authorized Convertible preferred stock, Authorized shares Preferred Stock, Shares Issued Convertible preferred stock, Issued shares Prepaid Taxes Prepaid income taxes Proceeds from Sale and Maturity of Marketable Securities Proceeds from sale of investment securities Proceeds from sale of assets Proceeds from Stock Options Exercised Proceeds from exercise of stock options Assets Held-for-sale, Property, Plant and Equipment PROPERTY HELD FOR SALE Property, Plant and Equipment, Net PROPERTY AND EQUIPMENT, net Provision for Doubtful Accounts Provision for doubtful accounts Payments to Acquire Marketable Securities Purchases of investment securities Payments to Acquire Property, Plant, and Equipment Purchases of property and equipment Payments for Repurchase of Common Stock Purchase of treasury stock Restricted cash Restricted Cash and Cash Equivalents, Noncurrent RESTRICTED CASH Restructuring and Related Activities Disclosure [Text Block] Exit Activity from Italy Facility: Retained Earnings (Accumulated Deficit) Retained earnings Sales Revenue, Goods, Net Net sales Other Sales Revenue, Net Other Inventory Disclosure [Text Block] Inventories: Subsequent Event Subsequent Events Selling, General and Administrative Expense Selling, general and administrative Condensed Consolidated Statements of Cash Flows Supplemental Cash Flow Information [Abstract] SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION: CURRENT ASSETS: Assets, Current [Abstract] Assets, Current Total current assets Weighted Average Number of Shares Outstanding, Diluted Diluted (in shares) Weighted Average Number of Shares Outstanding, Basic Basic (in shares) Common Stock Property, Plant and Equipment Disclosure [Text Block] Property and Equipment: Research and Development Expense Research and development Assets TOTAL ASSETS Deferred Tax Assets, Net, Noncurrent DEFERRED INCOME TAXES Deferred Tax Assets, Net, Current Deferred income taxes Deferred Tax Liabilities, Noncurrent DEFERRED INCOME TAXES ASSETS Assets [Abstract] Fair Value Disclosures [Text Block] Fair Value Measurement: Quarterly Financial Data - Unaudited Quarterly Financial Information [Text Block] Treasury Stock, Value Treasury stock, at cost - 1,123 shares at March 31, 2011 and 1,196 shares at December 31, 2010 Earnings Per Share, Basic Basic (in dollars per share) Excess Tax Benefit from Share-based Compensation, Financing Activities Tax benefits from exercise of stock options Preferred Stock, Par or Stated Value Per Share Convertible preferred stock, par value (in dollars per share) Common Stock, Shares, Issued Common stock, Issued shares OTHER ASSETS Preferred Stock, Shares Outstanding Convertible preferred stock, outstanding shares OPERATING EXPENSES: Operating Expenses [Abstract] Operating Expenses Total operating expenses NET INCOME PER SHARE Earnings Per Share [Abstract] Net income per share Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest Income before income taxes Common Stock, Par or Stated Value Per Share Common stock, par value (in dollars per share) Treasury Stock, Shares Treasury stock, shares Other Comprehensive Income, Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Foreign currency translation adjustment Tax effect of foreign currency translation adjustment Income before income taxes Total stockholders' equity BALANCE, beginning of year BALANCE, end of year Income Tax Expense (Benefit) PROVISION FOR INCOME TAXES Convertible Preferred Stock, Nonredeemable or Redeemable, Issuer Option, Value Convertible preferred stock, $1.00 par value Authorized-500 shares; Issued and outstanding - none Comprehensive Income, Net of Tax, Attributable to Parent [Abstract] Comprehensive income Additional Paid-In Capital Retained Earnings Accumulated Other Comprehensive Income Minority interest share transfer Adjustments to Additional Paid in Capital, Reallocation of Noncontrolling Interest Goodwill GOODWILL Stock compensation Proceeds from employee stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Exercise of stock options, including excess income tax benefits of $1,680, $101 and $8,996 for the period ended December 31, 2010, 2009 and 2008, respectively Stock Issued During Period, Value, Stock Options Exercised Proceeds from employee stock purchase plan (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Exercise of stock options (in shares) Stock Issued During Period, Shares, Stock Options Exercised Purchase of treasury stock Purchase of treasury stock (in shares) Treasury Stock, Shares, Acquired Liability for Uncertain Tax Positions, Noncurrent INCOME TAX LIABILITY Comprehensive Income Purchase of treasury stock Payments for (Proceeds from) Loans Receivable Proceeds from finance loan repayments Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation Research and development tax credit originating from stock options and other tax benefits Depreciation, Depletion and Amortization Depreciation and amortization Income Taxes Receivable, Noncurrent INCOME TAXES RECEIVABLE STOCKHOLDERS' EQUITY: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Total stockholders' equity BALANCE BALANCE Accounts Payable, Current Accounts payable Accrued Liabilities, Current Accrued liabilities Commitments and Contingencies. COMMITMENTS AND CONTINGENCIES Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Prepaid expenses and other current assets Sum of the amounts paid in advance for prepaid costs that will be expensed and non-trade receivables. Prepaid Expenses and Other Assets, Current Prepaid and deferred income taxes The net change during the reporting period in the carrying amount as of the balance sheet date of payments made for taxes. Also includes the net change during the reporting period in the account that represents the temporary difference that results from income (loss) that is recognized for accounting purposes but not for tax purposes and vice versa. Increase Decrease in Prepaid and Deferred Income Taxes Other Revenue earned during the period from sources other than specified elsewhere in the taxonomy. Revenue, Other Document and Entity Information Restricted Cash and Intangible Assets Disclosure [Text Block] Restricted Cash, Intangible Assets and Goodwill Change in Restricted Cash and Intangible Assets recorded as a result of a small business acquisition completed during the period. Deferred revenue Increase (Decrease) in Deferred Revenue Assets purchased Payments to Acquire Commercial Rights and Physical Assets Cash outflow for asset purchase of commercial rights and physical assets. Statement [Table] Statement Statement [Line Items] Comprehensive income Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest WEIGHTED AVERAGE NUMBER OF SHARES Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basis of Presentation: Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Asset Purchase of Commercial Rights and Physical Assets Disclosure [Text Block] Asset Purchase Asset purchase of commercial rights and physical assets. Net Income (Loss) Attributable to Noncontrolling Interest MINORITY INTEREST Minority interest Proceeds from sale of asset Proceeds from Sale of Property, Plant, and Equipment Accrued Liabilities Accounts Payable and Accrued Liabilities Disclosure [Text Block] Disclosure of Long Lived Assets Held-for-sale [Text Block] Asset Held for Sale Schedule of Stockholders' Equity Note, Warrants or Rights [Text Block] Stockholder Rights Plan Treasury Stock Schedule of Treasury Stock by Class [Text Block] Operating Leases of Lessee Disclosure [Text Block] Operating Leases CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND COMPREHENSIVE INCOME Statement, Equity Components [Axis] Equity Component [Domain] Treasury Stock Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity BALANCE (in shares) BALANCE (in shares) Shares, Issued Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Foreign currency translation adjustment net of tax effect of $(785), $(175), $74 for the year ended December 31, 2010, 2009 and 2008, respectively Other Comprehensive Income, Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Stockholders' Equity, Period Increase (Decrease) Stock Issued During Period, Shares, Period Increase (Decrease) Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value Stock compensation Exercise of stock options, excess income tax benefits Tax Benefit from Stock Options Exercised Other Comprehensive Income, Foreign Currency Translation Adjustment, Tax Foreign currency translation adjustment, tax of $(785)for 2010, $(175) for 2009, $74 for 2008 Foreign currency translation adjustment, tax effect Significant Accounting Policies and Accounting Changes [Text Block] This element may be used to describe all significant accounting policies, accounting estimates and new accounting pronouncements of the reporting entity. Summary of Significant Accounting Policies Litigation Matters [Text Block] Legal Settlement: Represents noncontingent litigation matters settled by the Company. Products, Major Customers and Concentrations of Credit Risks Segment Reporting Disclosure [Text Block] SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Share Based Awards Concentration Risk Disclosure [Text Block] Major Customer: Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net income NET INCOME Additional Paid in Capital, Common Stock Additional paid-in capital Deferred Revenue, Current Deferred revenue Condensed Consolidated Statements of Comprehensive Income Accrued Income Taxes, Current Income taxes payable Basis of Presentation: New Accounting Pronouncements: Fair Value Measurement: Inventories: Property and Equipment: Net Income Per Share: Income Taxes: Treasury Stock. Commitments and Contingencies: Subsequent Events: Asset Purchase Summary of Significant Accounting Policies Restricted Cash, Intangible Assets and Goodwill: Share Based Awards Investment Securities Accrued Liabilities Asset Held for Sale Exit Activity from Italy Facility: Stockholder Rights Plan Operating Leases Quarterly Financial Data - Unaudited Other Comprehensive Income (Loss), Tax Other comprehensive income (loss), tax Statement, Scenario [Axis] Scenario, Unspecified [Domain] Investment Income, Amortization of Premium Bond premium amortization Earnings Per Share [Text Block] Net Income Per Share: NON-CASH INVESTING ACTIVITIES: Other Noncash Investing and Financing Items [Abstract] Capital Expenditures Incurred but Not yet Paid Accrued liabilities for property and equipment Proceeds from Sale of Property Plant and Equipment and Payments to Acquire Commercial Rights and Physical Assets The cash inflow from sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services, and not intended for resale. Also includes the cash outflow for payments to acquire commercial rights and physical assets. Sale of asset (asset purchase) Proceeds from Insurance Settlement, Investing Activities Proceeds from insurance Deferred income taxes, noncurrent Increase (Decrease) in Deferred Income Taxes Legal settlement Legal Fees Legal Settlement: Major Customer: