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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating activities    
Net income $ 1,817,672 $ 432,117
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Stock-based compensation 209,864 217,178
Depreciation $ 197,686 216,577
Amortization of intangible assets 30,000
Deferred income tax expense $ 31,940 31,940
Loss on extinguishment of debt 61,500
Changes in operating assets and liabilities:    
Accounts receivable $ (462,182) (469,111)
Inventories (368,763) 147,761
Prepaid expenses and other current assets 38,151 $ (460)
Other assets 10,000
Accounts payable and accrued expenses (792,581) $ (517,100)
Accrued payroll and related expenses 74,733 $ (52,510)
Customer deposit 640,440
Net deferred revenue on shipments to distributors 25,705 $ (27,502)
Deferred service revenue (89,267) (52,878)
Change in deferred rent 19,578 34,702
Net cash provided by operating activities 1,352,976 52,214
Investing activities    
Purchases of equipment (391,375) (166,172)
Net cash used in investing activities (391,375) (166,172)
Financing activities    
Payments on capital leases (27,295) (21,831)
Proceeds from borrowings under bank line of credit agreement 138,453 988,764
Repayments of borrowings under bank line of credit agreement (954,434) (936,270)
Stock options exercised 155,949 47,171
Warrants exercised 131,250 137,500
Repayment of short term notes payable $ (100,000) (50,000)
Redemption of related party convertible notes payable (25,000)
Net cash (used in) provided by financing activities $ (656,077) 140,334
Net increase in cash and cash equivalents 305,524 26,376
Cash and cash equivalents at beginning of year 632,631 606,255
Cash and cash equivalents at end of year 938,155 632,631
Supplemental cash flow information    
Cash paid for interest 143,067 $ 280,762
Supplemental disclosure of non-cash investing activites    
Computer equipment purchased under capital lease $ 36,482