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Statements of Cash Flows - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Operating activities    
Net income $ 12,147,088 $ 1,817,672
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 342,610 209,864
Depreciation 279,392 197,686
Changes in deferred taxes (9,764,622) 31,940
Changes in operating assets and liabilities:    
Accounts receivable (507,994) (462,182)
Inventories (211,349) (368,763)
Prepaid expenses and other current assets (171,908) 38,151
Other assets 10,000
Accounts payable and accrued expenses (633,241) (792,581)
Accrued payroll and related expenses 30,043 74,733
Customer deposit (640,440) 640,440
Net deferred revenue on shipments to distributors 58,382 25,705
Deferred service revenue (51,992) (89,267)
Change in deferred rent 3,847 19,578
Net cash provided by operating activities 879,816 1,352,976
Investing activities    
Purchase of equipment (304,470) (391,375)
Net cash used in investing activities (304,470) (391,375)
Financing activities    
Payments on capital leases (31,152) (27,295)
Proceeds from borrowings under bank line of credit agreement 350,000 138,453
Repayments of borrowings under bank line of credit agreement (350,000) (954,434)
Stock options exercised 178,512 155,949
Warrants exercised 158,145 131,250
Repayments of related party and short term credit line notes payable (500,000) (100,000)
Net cash used in financing activities (194,495) (656,077)
Net increase in cash and cash equivalents 380,851 305,524
Cash and cash equivalents at beginning of year 938,155 632,631
Cash and cash equivalents at end of year 1,319,006 938,155
Supplemental cash flow information    
Cash paid for interest 13,261 143,067
Cash paid for income taxes 100,988
Supplemental disclosure of non-cash investing activities    
Computer equipment purchased under capital lease 64,102 36,482
Cashless exercise of warrants $ 35