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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Operating activities    
Net income (loss) $ (408,528) $ 1,289,831
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 361,674 315,237
Depreciation and amortization 314,770 236,059
Change in deferred taxes (151,215) 926,464
Changes in operating assets and liabilities:    
Accounts receivable 155,653 (547,020)
Inventories 305,053 (708,850)
Prepaid expenses and other current assets 71,658 (186,482)
Other assets 435 12,881
Accounts payable and accrued expenses 91,850 (9,478)
Accrued payroll and related expenses (102,234) 2,997
Net deferred income on shipments to distributors (4,777) 109,011
Customer deposit 56,700
Deferred service revenue (1,920) (8,749)
Change in deferred rent (19,976) (7,299)
Net cash provided by operating activities 612,443 1,481,302
Investing activities    
Purchases of equipment (388,802) (196,190)
Net cash used in investing activities (388,802) (196,190)
Financing activities    
Payments on capital leases (21,289) (19,921)
Proceeds from borrowings under bank line of credit agreement 9,416,353
Repayments of borrowings under bank line of credit agreement (7,889,663)
Proceeds from bank term loan 4,000,000
Repayments of bank term loan (3,041,667)
Common stock repurchases and related expenses (5,021,830)
Stock options exercised 279,177 282,826
Net cash (used in) provided by financing activities (2,278,919) 262,905
Net change in cash and cash equivalents (2,055,278) 1,548,017
Cash and cash equivalents at beginning of period 3,379,508 1,319,006
Cash and cash equivalents at end of period 1,324,230 2,867,023
Supplemental disclosure of cash flow information    
Cash paid for interest 86,754 2,339
Supplemental disclosure of non-cash investing and financing activities    
Conversion of notes payable and accrued interest into common stock $ 1,216,109