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Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating activities    
Net income $ 329,507 $ 21,390
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 96,455 115,794
Depreciation and amortization 99,697 153,120
Deferred income tax expense 15,970 15,970
Loss on extinguishment of debt   61,500
Changes in operating assets and liabilities:    
Accounts receivable (49,714) (776,326)
Inventories 336,235 377,332
Prepaid expenses and other current assets 36,081 (111,983)
Other assets (5,000)  
Accounts payable and accrued expenses (686,534) 208,170
Accrued payroll and related expenses (34,661) (1,065)
Deferred income on shipments to distributors (6,362) 44,768
Deferred service revenue (37,674) (5,999)
Change in deferred rent 13,644 21,059
Net cash provided by operating activities 107,644 123,730
Investing activities    
Purchases of equipment (62,028) (61,900)
Net cash used in investing activities (62,028) (61,900)
Financing activities    
Payments on capital leases (12,265) (11,201)
Proceeds from borrowings under bank line of credit agreement 29,190 1,695,778
Repayments of borrowings under bank line of credit agreement (29,352) (1,644,690)
Stock options exercised 33,154 6,993
Warrants exercised 131,250 12,500
Redemption of related party convertible note payable   (25,000)
Net cash provided by financing activities 151,977 34,380
Net increase in cash and cash equivalents 197,593 96,210
Cash and cash equivalents at beginning of period 632,631 606,255
Cash and cash equivalents at end of period 830,224 702,465
Supplemental cash flow information    
Cash paid for interest $ 81,443 $ 190,063