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Statements of Cash Flows - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating activities    
Net income $ 859,282 $ 452,510
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 151,924 164,370
Depreciation and amortization 149,069 196,010
Deferred income tax expense $ 23,955 23,955
Loss on extinguishment of debt 61,500
Changes in operating assets and liabilities:    
Accounts receivable $ (425,529) (290,309)
Inventories (14,795) 239,050
Prepaid expenses and other current assets 37,691 $ (19,435)
Other assets (5,000)
Accounts payable and accrued expenses (805,158) $ (287,262)
Accrued payroll and related expenses (10,758) (195,936)
Deferred income 909,669 (138,881)
Deferred service revenue (62,199) (40,305)
Change in deferred rent 16,611 28,970
Net cash provided by operating activities 824,762 194,237
Investing activities    
Purchases of tooling, capitalized software and equipment (278,302) (119,170)
Net cash used in investing activities (278,302) (119,170)
Financing activities    
Payments on capital leases (17,635) (16,994)
Proceeds from borrowings under bank line of credit agreement 136,805 973,927
Repayments of borrowings under bank line of credit agreement (539,574) (921,594)
Stock options exercised 72,133 35,399
Warrants exercised 131,250 $ 12,500
Repayment of short term note payable $ (100,000)
Redemption of related party convertible notes payable $ (25,000)
Net cash (used in) provided by financing activities $ (317,021) 58,238
Net increase in cash and cash equivalents 229,439 133,305
Cash and cash equivalents at beginning of period 632,631 606,255
Cash and cash equivalents at end of period 862,070 739,560
Supplemental cash flow information    
Cash paid for interest $ 115,430 $ 237,814