000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Statements of Income (Unaudited) link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Balance Sheets (Current Period Unaudited) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Balance Sheets (Current Period Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Statements of Changes in Stockholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 006 - Statement - Statements of Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 007 - Disclosure - Note 1 - Business link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 2 - Basis of Presentation link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 3 - Segment Information link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 4 - Impact of Global Supply Chain Instability, Inflation and Tariffs link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 5 - Use of Estimates link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 6 - Cash and Cash Equivalents link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 7 - Accounts Receivable and Reserves link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 8 - Revenue Recognition link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 9 - Accounting for Financial Instruments - Credit Losses link:calculationLink link:definitionLink link:presentationLink 016 - Disclosure - Note 10 - Marketable Securities link:calculationLink link:definitionLink link:presentationLink 017 - Disclosure - Note 11 - Inventories link:calculationLink link:definitionLink link:presentationLink 018 - Disclosure - Note 12 - Income Taxes link:calculationLink link:definitionLink link:presentationLink 019 - Disclosure - Note 13 - Defined Contribution Plan link:calculationLink link:definitionLink link:presentationLink 020 - Disclosure - Note 14 - Other Information link:calculationLink link:definitionLink link:presentationLink 021 - Disclosure - Note 15 - Recent Accounting Pronouncements link:calculationLink link:definitionLink link:presentationLink 022 - Disclosure - Note 16 - Concentration of Credit Risk link:calculationLink link:definitionLink link:presentationLink 023 - Disclosure - Note 17 - Supplier Concentration link:calculationLink link:definitionLink link:presentationLink 024 - Disclosure - Note 18 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 025 - Disclosure - Note 19 - Related Party Transactions link:calculationLink link:definitionLink link:presentationLink 026 - Disclosure - Note 20 - Dividends link:calculationLink link:definitionLink link:presentationLink 995445 - Disclosure - Note 6 - Cash and Cash Equivalents (Tables) link:calculationLink link:definitionLink link:presentationLink 995446 - Disclosure - Note 8 - Revenue Recognition (Tables) link:calculationLink link:definitionLink link:presentationLink 995447 - Disclosure - Note 10 - Marketable Securities (Tables) link:calculationLink link:definitionLink link:presentationLink 995448 - Disclosure - Note 11 - Inventories (Tables) link:calculationLink link:definitionLink link:presentationLink 995449 - Disclosure - Note 12 - Income Taxes (Tables) link:calculationLink link:definitionLink link:presentationLink 995450 - Disclosure - Note 14 - Other Information (Tables) link:calculationLink link:definitionLink link:presentationLink 995451 - Disclosure - Note 3 - Segment Information (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995452 - Disclosure - Note 6 - Cash and Cash Equivalents (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995453 - Disclosure - Note 6 - Cash and Cash Equivalents - Schedule of Cash and Cash Equivalents (Details) link:calculationLink link:definitionLink link:presentationLink 995454 - Disclosure - Note 7 - Accounts Receivable and Reserves (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995455 - Disclosure - Note 8 - Revenue Recognition (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995456 - Disclosure - Note 8 - Revenue Recognition - Disaggregated Revenue (Details) link:calculationLink link:definitionLink link:presentationLink 995457 - Disclosure - Note 8 - Revenue Recognition - Revenue by Geographic Region (Details) link:calculationLink link:definitionLink link:presentationLink 995458 - Disclosure - Note 10 - Marketable Securities (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995459 - Disclosure - Note 10 - Marketable Securities - Net Gains and Losses on Marketable Securities (Details) link:calculationLink link:definitionLink link:presentationLink 995460 - Disclosure - Note 10 - Marketable Securities - Summary of Investments (Details) link:calculationLink link:definitionLink link:presentationLink 995461 - Disclosure - Note 11 - Inventories (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995462 - Disclosure - Note 11 - Inventories - Summary of Inventories (Details) link:calculationLink link:definitionLink link:presentationLink 995463 - Disclosure - Note 12 - Income Taxes (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995464 - Disclosure - Note 12 - Income Taxes - Provision for Income Taxes (Details) link:calculationLink link:definitionLink link:presentationLink 995465 - Disclosure - Note 13 - Defined Contribution Plan (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995466 - Disclosure - Note 14 - Other Information - Summary of Accrued Expenses (Details) link:calculationLink link:definitionLink link:presentationLink 995467 - Disclosure - Note 16 - Concentration of Credit Risk (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995468 - Disclosure - Note 17 - Supplier Concentration (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995469 - Disclosure - Note 18 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995470 - Disclosure - Note 19 - Related Party Transactions (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note 20 - Dividends (Details Textual) link:calculationLink link:definitionLink link:presentationLink