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CONDENSED STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities    
Net loss $ (202,557) $ (2,609,997)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 201,974 469,117
Depreciation and amortization 203,193 255,331
Deferred income tax expense 23,955 23,955
Changes in operating assets and liabilities:    
Accounts receivable (264,110) 1,503,014
Inventories (115,326) 266,992
Prepaid expenses and other current assets 7,791 52,584
Other assets    (1,442)
Accounts payable (351,415) 18,579
Accrued payroll and related expenses (6,232) (37,717)
Deferred income on shipments to distributors 234,565 (578,088)
Deferred service revenue (82,846) (24,821)
Change in deferred rent 38,716 (5,949)
Net cash used in operating activities (312,292) (668,442)
Investing activities    
Purchases of equipment (133,203) (224,005)
Net cash used in investing activities (133,203) (224,005)
Financing activities    
Payments on capital leases (15,189) (10,366)
Proceeds from borrowings under bank line of credit agreement 6,280,846 5,158,618
Repayments of borrowings under bank line of credit agreement (6,245,072) (5,613,470)
Stock options exercised 6,480 14,015
Warrants exercised    29,999
Proceeds from the issuance of related party and other short term notes payable 600,000 800,000
Repayment of short term notes payable (145,289) (36,160)
Redemption of related party convertible note payable (25,000)   
Net cash provided by financing activities 456,776 342,636
Net increase (decrease) in cash and cash equivalents 11,281 (549,811)
Cash and cash equivalents at beginning of period 390,513 957,022
Cash and cash equivalents at end of period 401,794 407,211
Supplemental cash flow information    
Cash paid for interest $ 268,055 $ 129,968