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STATEMENTS OF CASH FLOWS (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Operating Activities:    
Net income $ 609,000 $ 938,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 824,000 806,000
Change in allowance for doubtful accounts 34,000 105,000
Deferred income tax expense   3,000
Stock-based compensation 300,000 324,000
Gain on sale of property and equipment (14,000) (12,000)
Changes in operating assets and liabilities:    
Accounts receivable (3,379,000) (1,309,000)
Inventories (89,000) (33,000)
Income tax receivable (1,000) 775,000
Prepaid expenses and other (526,000) 144,000
Accounts payable 86,000 729,000
Accrued liabilities (270,000) (220,000)
Excess tax benefit from stock options (11,000)  
Income tax payable 236,000 252,000
Deferred revenue 441,000 421,000
Net cash provided by (used in) operating activities (1,760,000) 2,923,000
Investing Activities:    
Purchases of property and equipment (319,000) (231,000)
Acquisition of selling rights and other (542,000)  
Purchases of investments (10,255,000)  
Proceeds from sale of investments 955,000  
Proceeds received from sale of property and equipment 14,000 15,000
Net cash used in investing activities (10,147,000) (216,000)
Financing Activities:    
Proceeds from issuance of common stock 199,000 85,000
Excess tax benefit from stock options 11,000  
Repurchase of common stock, net (1,886,000) (2,328,000)
Net cash used in financing activities (1,676,000) (2,243,000)
Increase (decrease) in cash and cash equivalents (13,583,000) 464,000
Cash and cash equivalents at beginning of period 21,763,000 20,271,000
Cash and cash equivalents at end of period 8,180,000 20,735,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes 377,000 557,000
Non-cash investing activities:    
Cashless exercise of options   $ 4,000