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Condensed Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating activities    
Net income (loss) $ 452,510 $ (202,557)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Stock-based compensation 164,370 201,974
Depreciation and amortization 196,010 203,193
Deferred income tax expense 23,955 23,955
Accrued interest on convertible notes 79,911 62,137
Loss on extinguishment of debt 61,500   
Changes in operating assets and liabilities:    
Accounts receivable (290,309) (264,110)
Inventories 239,050 (115,326)
Prepaid expenses and other current assets (19,435) 7,791
Accounts payable (363,753) (412,336)
Accrued payroll and related expenses (195,936) (6,232)
Deferred income on shipments to distributors (138,881) 234,565
Deferred service revenue (40,306) (82,846)
Change in deferred rent 28,970 38,716
Net cash provided by (used in) operating activities 197,656 (311,076)
Investing activities    
Purchases of equipment (119,170) (133,203)
Net cash used in investing activities (119,170) (133,203)
Financing activities    
Payments on capital leases (16,993) (15,189)
Proceeds from borrowings under bank line of credit agreement 973,927 6,280,846
Repayments of borrowings under bank line of credit agreement (921,594) (6,245,072)
Stock options exercised 35,399 6,480
Warrants exercised 12,500   
Proceeds from the issuance of related party and other short term notes payable    600,000
Repayment of short term note payable    (145,289)
Redemption of related party convertible notes payable (28,420) (26,216)
Net cash provided by financing activities 54,819 455,560
Net increase in cash and cash equivalents 133,305 11,281
Cash and cash equivalents at beginning of period 606,255 390,513
Cash and cash equivalents at end of period 739,560 401,794
Supplemental cash flow information    
Cash paid for interest $ 237,814 $ 268,055