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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Operating activities    
Net income (loss) $ 74,802 $ (871,774)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Stock-based compensation 93,735 177,933
Depreciation and amortization 66,959 93,997
Deferred income tax expense 7,985 7,985
Changes in operating assets and liabilities:    
Accounts receivable (425,228) 626,665
Inventories (66,972) (445,632)
Prepaid expenses and other current assets (148,487) 51,506
Other assets    5,833
Accounts payable 247,649 592,867
Accrued payroll and related expenses 56,823 26,159
Deferred income on shipments to distributors (169,322) 71,260
Deferred service revenue (19,028) 18,565
Change in deferred rent 14,093 (4,023)
Net cash (used in) provided by operating activities (266,991) 351,341
Investing activities    
Purchases of equipment    (106,388)
Net cash used in investing activities    (106,388)
Financing activities    
Payments on capital leases (4,269) (3,392)
Proceeds from borrowings under bank line of credit agreement 1,597,759 2,082,261
Repayments of borrowings under bank line of credit agreement (1,532,940) (2,337,136)
Stock options exercised    14,015
Proceeds from the issuance of related party and other short term notes payable 550,000   
Repayment of short term note payable (95,289)   
Net cash provided by (used in) financing activities 515,261 (244,252)
Net increase in cash and cash equivalents 248,270 701
Cash and cash equivalents at beginning of period 390,513 957,022
Cash and cash equivalents at end of period 638,783 957,723
Supplemental cash flow information    
Cash paid for interest $ 68,433 $ 35,007