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Statements of Cash Flows (Unaudited) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating activities    
Net income $ 1,289,831 $ 1,734,302
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 315,237 244,052
Depreciation and amortization 236,059 209,707
Deferred income tax expense 926,464 23,954
Changes in operating assets and liabilities:    
Accounts receivable (547,020) (294,941)
Inventories (708,850) 186,475
Prepaid expenses and other current assets (186,482) (139,946)
Other assets 12,881
Accounts payable and accrued expenses (9,478) (639,303)
Accrued payroll and related expenses 2,997 (40,759)
Net deferred income on shipments to distributors 109,011 21,324
Customer deposit 56,700 (640,440)
Deferred service revenue (8,749) (37,692)
Change in deferred rent (7,299) 4,890
Net cash provided by operating activities 1,481,302 631,623
Investing activities    
Purchases of equipment (196,190) (175,080)
Net cash used in investing activities (196,190) (175,080)
Financing activities    
Payments on capital leases (19,921) (24,798)
Proceeds from borrowings under bank line of credit agreement 350,000
Repayments of borrowings under bank line of credit agreement (350,000)
Repayments of related party and other short term credit line notes payable (500,000)
Proceeds from stock options exercised 282,826 118,068
Proceeds from warrants exercised 158,145
Net cash provided by (used in) financing activities 262,905 (248,585)
Net increase in cash and cash equivalents 1,548,017 207,958
Cash and cash equivalents at beginning of period 1,319,006 938,155
Cash and cash equivalents at end of period 2,867,023 1,146,113
Supplemental disclosure of cash flow information    
Cash paid for interest 2,339 12,873
Supplemental disclosure of non-cash investing and financing activities    
Equipment purchased under capital lease 64,101
Cashless exercise of warrants $ 35