2101100 - Disclosure - Basis of Presentation: link:presentationLink link:calculationLink link:definitionLink 2114100 - Disclosure - Commitments and Contingencies: link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 1004000 - Statement - Condensed Consolidated Statements of Cash Flows link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - Condensed Consolidated Statements of Comprehensive Income link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - Condensed Consolidated Statements of Income link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - DEI Document link:presentationLink link:calculationLink link:definitionLink 2105100 - Disclosure - Fair Value Measurement: link:presentationLink link:calculationLink link:definitionLink 2405402 - Disclosure - Fair Value Measurement: (Details) link:presentationLink link:calculationLink link:definitionLink 2305301 - Disclosure - Fair Value Measurement: (Tables) link:presentationLink link:calculationLink link:definitionLink 2112100 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2412401 - Disclosure - Income Taxes: Effective tax rate (Details) link:presentationLink link:calculationLink link:definitionLink 2108100 - Disclosure - Inventories: link:presentationLink link:calculationLink link:definitionLink 2408402 - Disclosure - Inventories: (Details) link:presentationLink link:calculationLink link:definitionLink 2308301 - Disclosure - Inventories: (Tables) link:presentationLink link:calculationLink link:definitionLink 2106100 - Disclosure - Investment Securities: link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Investment Securities: (Details) link:presentationLink link:calculationLink link:definitionLink 2306301 - Disclosure - Investment Securities: (Tables) link:presentationLink link:calculationLink link:definitionLink 2111100 - Disclosure - Major Customer: link:presentationLink link:calculationLink link:definitionLink 2411401 - Disclosure - Major Customer: (Details) link:presentationLink link:calculationLink link:definitionLink 2110100 - Disclosure - Net Income Per Share: link:presentationLink link:calculationLink link:definitionLink 2410402 - Disclosure - Net Income Per Share: (Details) link:presentationLink link:calculationLink link:definitionLink 2310301 - Disclosure - Net Income Per Share: (Tables) link:presentationLink link:calculationLink link:definitionLink 2102100 - Disclosure - New Accounting Pronouncements: link:presentationLink link:calculationLink link:definitionLink 2109100 - Disclosure - Property and Equipment: link:presentationLink link:calculationLink link:definitionLink 2409402 - Disclosure - Property and Equipment: (Details) link:presentationLink link:calculationLink link:definitionLink 2309301 - Disclosure - Property and Equipment: (Tables) link:presentationLink link:calculationLink link:definitionLink 2415402 - Disclosure - Treasury Stock (Details) link:presentationLink link:calculationLink link:definitionLink 2115100 - Disclosure - Treasury Stock (Notes) link:presentationLink link:calculationLink link:definitionLink 2315301 - Disclosure - Treasury Stock (Tables) link:presentationLink link:calculationLink link:definitionLink 2415403 - Disclosure - Treasury Stock Treasury stock acquired (Details) link:presentationLink link:calculationLink link:definitionLink