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STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Operating Activities:    
Net income (loss) $ 584,000 $ (2,073,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 548,000 567,000
Stock-based compensation 216,000 250,000
Gain on sale of property and equipment (12,000)  
Changes in operating assets and liabilities:    
Accounts receivable (357,000) 62,000
Inventories (55,000) 16,000
Income tax receivable 765,000 (922,000)
Prepaid expenses and other 166,000 322,000
Accounts payable 780,000 (270,000)
Accrued liabilities (582,000) (890,000)
Income tax payable 434,000 (748,000)
Deferred revenue 216,000 219,000
Net cash provided by (used in) operating activities 2,703,000 (3,467,000)
Investing Activities:    
Purchases of property and equipment, net (138,000) (46,000)
Proceeds received from sale of property and equipment 15,000  
Net cash used in investing activities (123,000) (46,000)
Financing Activities:    
Proceeds from issuance of common stock, net 79,000 131,000
Repurchase of common stock, net   (213,000)
Net cash provided by (used in) financing activities 79,000 (82,000)
Increase (decrease) in cash and cash equivalents 2,659,000 (3,595,000)
Cash and cash equivalents at beginning of period 20,271,000 23,202,000
Cash and cash equivalents at end of period 22,930,000 19,607,000
Supplemental disclosures for cash flow information:    
Cash paid during the year for income taxes $ 177,000 $ 790,000