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CONDENSED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating activities    
Net income (loss) $ 118,311 $ (1,627,174)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Stock-based compensation 151,292 363,460
Depreciation and amortization 132,732 183,303
Deferred income tax expense 15,970 15,970
Changes in operating assets and liabilities:    
Accounts receivable (960,480) 1,285,061
Inventories (91,099) (304,602)
Prepaid expenses and other current assets 9,977 58,608
Other assets    (1,442)
Accounts payable (58,570) 417,088
Accrued payroll and related expenses 82,897 43,383
Deferred income on shipments to distributors 170,116 (402,354)
Deferred service revenue (49,054) 12,314
Change in deferred rent 28,187 (8,043)
Net cash (used in) provided by operating activities (449,721) 35,572
Investing activities    
Purchases of equipment (41,860) (205,827)
Net cash used in investing activities (41,860) (205,827)
Financing activities    
Payments on capital leases (9,656) (6,202)
Proceeds from borrowings under bank line of credit agreement 4,422,333 3,896,718
Repayments of borrowings under bank line of credit agreement (4,087,966) (4,108,903)
Stock options exercised 6,480 14,015
Warrants exercised    29,999
Proceeds from the issuance of related party and other short term notes payable 550,000   
Repayment of short term note payable (95,289)   
Redemption of related party convertible note payable (25,000)   
Net cash provided by (used in) financing activities 760,902 (174,373)
Net increase (decrease) in cash and cash equivalents 269,321 (344,628)
Cash and cash equivalents at beginning of period 390,513 957,022
Cash and cash equivalents at end of period 659,834 612,394
Supplemental cash flow information    
Cash paid for interest $ 163,998 $ 61,319