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Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activities    
Net income $ 1,065,252 $ 329,507
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 150,822 96,455
Depreciation and amortization 132,970 99,697
Deferred income tax expense 15,969 15,970
Changes in operating assets and liabilities:    
Accounts receivable (86,424) (49,714)
Inventories 446,845 336,235
Prepaid expenses and other current assets (110,870) 36,081
Other assets (5,000) (5,000)
Accounts payable and accrued expenses (620,481) (686,534)
Accrued payroll and related expenses (42,383) (34,661)
Net deferred revenue on shipments to distributors 170,333 (6,362)
Customer deposit (640,440)
Deferred service revenue (25,092) (37,674)
Change in deferred rent 5,933 13,644
Net cash provided by operating activities 457,434 107,644
Investing activities    
Purchases of equipment (98,905) (62,028)
Net cash used in investing activities (98,905) (62,028)
Financing activities    
Payments on capital leases (18,523) (12,265)
Proceeds from borrowings under bank line of credit agreement 350,000 29,190
Repayments of borrowings under bank line of credit agreement (350,000) (29,352)
Repayments of related party notes payable (500,000)
Stock options exercised 117,609 33,154
Warrants exercised 158,145 131,250
Net cash provided by (used in) financing activities (242,769) 151,977
Net increase in cash and cash equivalents 115,760 197,593
Cash and cash equivalents at beginning of period 938,155 632,631
Cash and cash equivalents at end of period 1,053,915 830,224
Supplemental disclosure of cash flow information    
Cash paid for interest 11,738 81,443
Supplemental disclosure of non-cash investing and financing activities    
Cashless exercise of warrants $ 35 $ 20