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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating activities    
Net income (loss) $ (225,029) $ 385,807
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 112,133 95,697
Depreciation and amortization 91,394 78,788
Changes in deferred taxes (79,927) 239,552
Changes in operating assets and liabilities:    
Accounts receivable (237,731) (488,191)
Inventories (80,982) (304,673)
Prepaid expenses and other current assets 76,255 (68,389)
Accounts payable and accrued expenses 104,887 353,237
Accrued payroll and related expenses (91,598) (83,921)
Net deferred revenue on shipments to distributors (57,648) 40,323
Deferred service revenue 4,695 (6,351)
Change in deferred rent (5,213) (1,043)
Net cash (used in) provided by operating activities (388,764) 240,836
Investing activities    
Purchases of equipment (164,198) (83,519)
Net cash used in investing activities (164,198) (83,519)
Financing activities    
Payments on capital leases (7,089) (6,441)
Proceeds from term loan advance 4,000,000
Common stock repurchase and related expenses (5,019,748)
Stock options exercised 275,145 152,463
Net cash (used in) provided by financing activities (751,692) 146,022
Net increase (decrease) in cash and cash equivalents (1,304,654) 303,339
Cash and cash equivalents at beginning of period 3,379,508 1,319,006
Cash and cash equivalents at end of period 2,074,854 1,622,345
Supplemental disclosure of cash flow information    
Cash paid for interest $ 353 $ 968