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STATEMENTS OF CASH FLOWS (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Operating activities    
Net loss $ (620,493) $ (3,298,082)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Stock-based compensation 249,704 597,668
Depreciation 221,337 264,512
Amortization of intangible assets 60,000 60,000
Deferred income tax expense 31,939 31,940
Fair value of common stock issued to settle litigation 28,500   
Changes in operating assets and liabilities:    
Accounts receivable 81,505 1,282,455
Inventories (164,021) 519,985
Prepaid expenses and other current assets 9,787 77,986
Accounts payable and accrued expenses (194,990) 410,445
Accrued payroll and related expenses 102,580 (86,896)
Deferred income on shipments to distributors 151,898 (717,385)
Deferred service revenue (100,891) (46,236)
Change in deferred rent 49,245 (3,853)
Net cash used in operating activities (93,900) (907,461)
Investing activities    
Purchase of equipment and tooling (158,903) (234,856)
Net cash used in investing activities (158,903) (234,856)
Financing activities    
Payments on capital leases (20,447) (14,581)
Proceeds from borrowings under bank line of credit agreement 8,017,095 6,438,779
Repayments of borrowings under bank line of credit agreement (8,064,294) (6,737,693)
Stock options exercised 6,480 14,015
Warrants exercised    29,999
Proceeds from issuance of related party subordinated convertible notes payable    750,000
Proceeds from issuance of short term note payable 700,000 400,000
Repayment of short term notes payable (145,289) (304,711)
Repayment of related party subordinated convertible note payable (25,000)   
Net cash provided by financing activities 468,545 575,808
Net increase (decrease) in cash and cash equivalents 215,742 (566,509)
Cash and cash equivalents at beginning of year 390,513 957,022
Cash and cash equivalents at end of year 606,255 390,513
Supplemental cash flow information    
Cash paid for interest 387,092 224,775
Non-cash investing and financing activities:    
Conversion of accrued note payable interest to note principal 52,625   
Addition of equipment under capital lease $ 14,600 $ 0