000 - Document - Document And Entity Information link:calculationLink link:definitionLink link:presentationLink 001 - Statement - Condensed Balance Sheets (Current Period Unaudited) link:calculationLink link:definitionLink link:presentationLink 002 - Statement - Condensed Balance Sheets (Current Period Unaudited) (Parentheticals) link:calculationLink link:definitionLink link:presentationLink 003 - Statement - Condensed Statements of Operations (Unaudited) link:calculationLink link:definitionLink link:presentationLink 004 - Statement - Condensed Statements of Stockholders' Equity (Unaudited) link:calculationLink link:definitionLink link:presentationLink 005 - Statement - Condensed Statements of Cash Flows (Unaudited) link:calculationLink link:definitionLink link:presentationLink 006 - Disclosure - Note 1 - Nature of Business and Summary of Significant Accounting Policies link:calculationLink link:definitionLink link:presentationLink 007 - Disclosure - Note 2 - Accounts Receivable link:calculationLink link:definitionLink link:presentationLink 008 - Disclosure - Note 3 - Net Investment in Sales Type Lease link:calculationLink link:definitionLink link:presentationLink 009 - Disclosure - Note 4 - Operating Leases link:calculationLink link:definitionLink link:presentationLink 010 - Disclosure - Note 5 - Bank Financing link:calculationLink link:definitionLink link:presentationLink 011 - Disclosure - Note 6 - Stockholders' Equity link:calculationLink link:definitionLink link:presentationLink 012 - Disclosure - Note 7 - Earnings Per Share link:calculationLink link:definitionLink link:presentationLink 013 - Disclosure - Note 8 - Income Tax link:calculationLink link:definitionLink link:presentationLink 014 - Disclosure - Note 9 - Segment Information link:calculationLink link:definitionLink link:presentationLink 015 - Disclosure - Note 10 - Subsequent Event link:calculationLink link:definitionLink link:presentationLink 995462 - Disclosure - Significant Accounting Policies (Policies) link:calculationLink link:definitionLink link:presentationLink 995463 - Disclosure - Note 1 - Nature of Business and Summary of Significant Accounting Policies (Tables) link:calculationLink link:definitionLink link:presentationLink 995464 - Disclosure - Note 2 - Accounts Receivable (Tables) link:calculationLink link:definitionLink link:presentationLink 995465 - Disclosure - Note 3 - Net Investment in Sales Type Lease (Tables) link:calculationLink link:definitionLink link:presentationLink 995466 - Disclosure - Note 4 - Operating Leases (Tables) link:calculationLink link:definitionLink link:presentationLink 995467 - Disclosure - Note 6 - Stockholders' Equity (Tables) link:calculationLink link:definitionLink link:presentationLink 995468 - Disclosure - Note 7 - Earnings Per Share (Tables) link:calculationLink link:definitionLink link:presentationLink 995469 - Disclosure - Note 8 - Income Tax (Tables) link:calculationLink link:definitionLink link:presentationLink 995470 - Disclosure - Note 1 - Nature of Business and Summary of Significant Accounting Policies (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995471 - Disclosure - Note 1 - Nature of Business and Summary of Significant Accounting Policies - Disaggregated Revenues by Major Product Line (Details) link:calculationLink link:definitionLink link:presentationLink 995472 - Disclosure - Note 1 - Nature of Business and Summary of Significant Accounting Policies - Major Customers (Details) link:calculationLink link:definitionLink link:presentationLink 995473 - Disclosure - Note 2 - Accounts Receivable - Accounts Receivable (Details) link:calculationLink link:definitionLink link:presentationLink 995474 - Disclosure - Note 2 - Accounts Receivable - Allowance for Doubtful Accounts (Details) link:calculationLink link:definitionLink link:presentationLink 995475 - Disclosure - Note 3 - Net Investment in Sales Type Lease (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995476 - Disclosure - Note 3 - Net Investment in Sales Type Lease - Future Minimum Lease Payments Receivable (Details) link:calculationLink link:definitionLink link:presentationLink 995477 - Disclosure - Note 4 - Operating Leases (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995478 - Disclosure - Note 4 - Operating Leases - Maturities of Lease (Details) link:calculationLink link:definitionLink link:presentationLink 995479 - Disclosure - Note 4 - Operating Leases - Schedule of Lease Expenses (Details) link:calculationLink link:definitionLink link:presentationLink 995480 - Disclosure - Note 5 - Bank Financing (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995481 - Disclosure - Note 6 - Stockholders' Equity 1 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995482 - Disclosure - Note 6 - Stockholders' Equity 2 (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995483 - Disclosure - Note 6 - Stockholders' Equity - Cash Dividends (Details) link:calculationLink link:definitionLink link:presentationLink 995484 - Disclosure - Note 6 - Stockholders' Equity - Summary of Additional Information About Stock Options Outstanding and Exercisable (Details) link:calculationLink link:definitionLink link:presentationLink 995485 - Disclosure - Note 6 - Stockholders' Equity - Option Activity (Details) link:calculationLink link:definitionLink link:presentationLink 995486 - Disclosure - Note 7 - Earnings Per Share (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995487 - Disclosure - Note 7 - Earnings Per Share - Basic and Diluted Earnings Per Share (Details) link:calculationLink link:definitionLink link:presentationLink 995488 - Disclosure - Note 8 - Income Tax (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995489 - Disclosure - Note 8 - Income Tax - Income Tax Reconciliation (Details) link:calculationLink link:definitionLink link:presentationLink 995490 - Disclosure - Note 9 - Segment Information (Details Textual) link:calculationLink link:definitionLink link:presentationLink 995491 - Disclosure - Note 10 - Subsequent Event (Details Textual) link:calculationLink link:definitionLink link:presentationLink