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Condensed Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Operating activities    
Net loss $ (871,774) $ (928,260)
Adjustments to reconcile net loss to net cash used in operating activities:    
Stock-based compensation 177,933 178,503
Depreciation and amortization 93,997 105,640
Amortization of debt discount to interest expense    316,216
Non cash interest expense on convertible note    4,029
Deferred income tax expense 7,985 7,985
Changes in operating assets and liabilities:    
Accounts receivable 626,665 (873,600)
Inventories (445,632) 323,382
Prepaid expenses and other current assets 51,506 (74,306)
Other assets 5,833 23,367
Accounts payable 592,867 661,655
Accrued payroll and related expenses 26,159 (16,873)
Deferred income on shipments to distributors 71,260 (77,698)
Deferred service revenue 18,565 (46,231)
Deferred rent (4,023) (1,943)
Net cash used in operating activities 351,341 (398,134)
Investing activities    
Purchases of equipment and tooling (106,388) (11,488)
Net cash used in investing activities (106,388) (11,488)
Financing activities    
Payments on capital leases (3,392) (3,195)
Reduction in restricted cash requirement    710,797
Proceeds from borrowings under bank line of credit agreement 2,082,261   
Repayments of borrowings under bank line of credit agreement (2,337,136)   
Stock options exercised 14,015   
Net cash provided by (used in) financing activities (244,252) 707,602
Net increase in cash and cash equivalents 701 297,980
Cash and cash equivalents at beginning of period 957,022 460,833
Cash and cash equivalents at end of period 957,723 758,813
Supplemental cash flow information    
Cash paid for interest 35,007 12,143
Issuance of common stock for reduction in accounts payable balance    499,998
Beneficial conversion feature associated with senior convertible note payable    273,904
Conversion of senior convertible note payable and accrued interest to common stock    $ 204,029