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Condensed Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net income (loss) $ (363,271) $ 875,731
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 230,976 203,086
Depreciation and amortization 197,554 159,105
Changes in operating assets and liabilities:    
Accounts receivable 379,102 (223,245)
Inventories (14,674) (696,709)
Prepaid expenses and other current assets 87,855 (247,529)
Other assets 435 11,640
Accounts payable and accrued expenses 180,782 (71)
Accrued payroll and related expenses (117,051) (26,979)
Net deferred income on shipments to distributors (28,129) 35,921
Deferred service revenue (939) (420)
Change in deferred rent (10,425) (2,086)
Net cash provided by operating activities 408,581 702,433
Investing activities    
Purchases of equipment (269,942) (87,738)
Net cash used in investing activities (269,942) (87,738)
Financing activities    
Payments on capital leases (14,242) (12,961)
Proceeds from borrowings under bank line of credit agreement 5,716,353
Repayments of borrowings under bank line of credit agreement (4,181,291)
Proceeds from bank term loan 4,000,000
Repayments of bank term loan (3,000,000)
Common stock repurchases and related expenses (5,021,830)
Stock options exercised 279,177 213,671
Net cash (used in) provided by financing activities (2,221,833) 200,710
Net increase (decrease) in cash and cash equivalents (2,083,194) 815,405
Cash and cash equivalents at beginning of period 3,379,508 1,319,006
Cash and cash equivalents at end of period 1,296,314 2,134,411
Supplemental disclosure of cash flow information    
Cash paid for interest $ 56,749 $ 1,857