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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating activities    
Net income (loss) $ 286,586 $ (571,141)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Stock-based compensation 519,891 487,806
Depreciation and amortization 462,930 432,042
Changes in deferred taxes 274,004 (143,459)
Changes in operating assets and liabilities:    
Accounts receivable (469,829) 320,148
Inventories (906,580) (74,062)
Prepaid expenses and other current assets (4,295) 77,677
Other long-term assets (1,320) 435
Accounts payable and accrued expenses 551,392 421,222
Accrued payroll and related expenses 54,043 (118,692)
Net deferred revenue on shipments to distributors 145,256 (56,256)
Deferred service revenue 8,676 3,952
Change in deferred rent (47,220) (29,527)
Net cash provided by operating activities 873,534 750,145
Investing activities    
Purchase of equipment (595,154) (423,700)
Capitalized software costs (7,800)
Net cash used in investing activities (602,954) (423,700)
Financing activities    
Payments on operating leases (15,696) (28,420)
Proceeds from borrowings under bank line of credit agreement 17,423,000 13,546,964
Repayments of borrowings under bank line of credit agreement (17,327,329) (12,230,186)
Proceeds from bank term loan 4,000,000
Repayments of bank term loan (500,000) (3,166,667)
Common stock repurchases and related expenses (5,021,830)
Stock options exercised 23,314 279,177
Net cash used in financing activities (396,711) (2,620,962)
Net increase (decrease) in cash and cash equivalents (126,131) (2,294,517)
Cash and cash equivalents at beginning of year 1,084,991 3,379,508
Cash and cash equivalents at end of year 958,860 1,084,991
Supplemental cash flow information    
Cash paid for interest $ 100,048 $ 105,082