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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net income (loss) $ 131,629 $ (363,271)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 259,000 230,976
Depreciation and amortization 217,664 197,554
Changes in deferred taxes 74,619 (133,634)
Changes in operating assets and liabilities:    
Accounts receivable (550,425) 379,102
Inventories (123,005) (14,674)
Prepaid expenses and other current assets (278,629) 88,290
Accounts payable and accrued expenses (110,835) 180,782
Accrued payroll and related expenses 133,808 (117,051)
Net deferred income on shipments to distributors 107,166 (28,129)
Deferred service revenue 20,766 (939)
Net change in operating lease (19,099) (10,425)
Net cash (used in) provided by operating activities (137,341) 408,581
Investing activities    
Purchases of equipment (187,458) (269,942)
Net cash used in investing activities (187,458) (269,942)
Financing activities    
Payments on financing leases (7,680) (14,242)
Proceeds from borrowings under bank line of credit agreement 8,754,000 5,716,353
Repayments of borrowings under bank line of credit agreement (8,240,804) (4,181,291)
Proceeds from bank term loan 4,000,000
Repayments of bank term loan (250,000) (3,000,000)
Common stock repurchases and related expenses (5,021,830)
Stock options exercised 279,177
Net cash (used in) provided by financing activities 255,516 (2,221,833)
Net decrease in cash and cash equivalents (69,283) (2,083,194)
Cash and cash equivalents at beginning of period 1,084,991 3,379,508
Cash and cash equivalents at end of period 1,015,708 1,296,314
Supplemental disclosure of cash flow information    
Cash paid for interest $ 54,528 $ 56,749