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Statements of Cash Flows - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating activities    
Net income (loss) $ 548,314 $ (71,560)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Stock-based compensation 65,219 46,568
Depreciation and amortization 64,333 50,301
Deferred income tax expense 7,985 7,985
Changes in operating assets and liabilities:    
Accounts receivable (28,780) 226,122
Inventories (184,680) 149,450
Prepaid expenses and other current assets (38,373) 31,145
Accounts payable and accrued expenses 113,227 (351,113)
Accrued payroll and related expenses (47,521) (4,800)
Net deferred revenue on shipments to distributors (80,156) $ (90,718)
Customer deposit (318,859)
Deferred service revenue (13,159) $ (15,708)
Change in deferred rent 2,967 6,822
Net cash provided by (used in) operating activities 90,517 (15,506)
Investing activities    
Purchases of equipment (57,091) (28,232)
Net cash used in investing activities (57,091) (28,232)
Financing activities    
Payments on capital leases (9,836) (6,063)
Proceeds from borrowings under bank line of credit agreement $ 350,000 14,515
Repayments of borrowings under bank line of credit agreement $ (14,515)
Repayments of related party notes payable $ (500,000)
Stock options exercised 57,918 $ 29,152
Warrants exercised 158,145 131,250
Net cash provided by financing activities 56,227 154,339
Net increase in cash and cash equivalents 89,653 110,601
Cash and cash equivalents at beginning of period 938,155 632,631
Cash and cash equivalents at end of period 1,027,808 743,232
Supplemental disclosure of cash flow information    
Cash paid for interest 8,859 43,036
Supplemental disclosure of non-cash investing and financing activities    
Cashless exercise of warrants $ 35 $ 20