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Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating activities    
Net income $ 385,807 $ 548,314
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 95,697 65,219
Depreciation and amortization 78,788 64,333
Changes in deferred taxes 239,551 7,985
Changes in operating assets and liabilities:    
Accounts receivable (488,191) (28,780)
Inventories (304,673) (184,680)
Prepaid expenses and other current assets (68,389) (38,373)
Accounts payable and accrued expenses 353,237 113,227
Accrued payroll and related expenses (83,921) (47,521)
Net deferred revenue on shipments to distributors 40,323 (80,156)
Customer deposit (318,859)
Deferred service revenue (6,351) (13,159)
Change in deferred rent (1,043) 2,967
Net cash provided by operating activities 240,836 90,517
Investing activities    
Purchases of equipment (83,519) (57,091)
Net cash used in investing activities (83,519) (57,091)
Financing activities    
Payments on capital leases (6,441) (9,836)
Proceeds from borrowings under bank line of credit agreement 350,000
Repayments of related party notes payable (500,000)
Stock options exercised 152,463 57,918
Warrants exercised 158,145
Net cash provided by financing activities 146,022 56,227
Net increase in cash and cash equivalents 303,339 89,653
Cash and cash equivalents at beginning of period 1,319,006 938,155
Cash and cash equivalents at end of period 1,622,345 1,027,808
Supplemental disclosure of cash flow information    
Cash paid for interest 968 8,859
Cash paid for income taxes
Supplemental disclosure of non-cash investing and financing activities    
Cashless exercise of warrants $ 35