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STATEMENTS OF CASH FLOWS (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Operating Activities:    
Net income $ 185,000 $ 584,000
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 539,000 548,000
Stock-based compensation 217,000 216,000
Gain on sale of property and equipment (14,000) (12,000)
Changes in operating assets and liabilities:    
Accounts receivable (1,608,000) (357,000)
Inventories (33,000) (55,000)
Income tax receivable (38,000) 765,000
Prepaid expenses and other (33,000) 166,000
Accounts payable (779,000) 780,000
Accrued liabilities (393,000) (582,000)
Income tax payable (22,000) 434,000
Deferred revenue 670,000 216,000
Net cash provided by (used in) operating activities (1,309,000) 2,703,000
Investing Activities:    
Purchases of property and equipment (163,000) (138,000)
Acquisition of selling rights and other (542,000)  
Proceeds received from sale of property and equipment 14,000 15,000
Net cash used in investing activities (691,000) (123,000)
Financing Activities:    
Proceeds from issuance of common stock, net 178,000 79,000
Repurchase of common stock, net (455,000)  
Net cash provided by (used in) financing activities (277,000) 79,000
Increase (decrease) in cash and cash equivalents (2,277,000) 2,659,000
Cash and cash equivalents at beginning of period 21,763,000 20,271,000
Cash and cash equivalents at end of period 19,486,000 22,930,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes $ 247,000 $ 177,000