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STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Operating Activities:    
Net income $ 346,000 $ 185,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 567,000 539,000
Changes in allowance for doubtful accounts (32,000)  
Deferred income tax expense 119,000  
Stock-based compensation expense 278,000 217,000
Gain on sale of property and equipment   (14,000)
Changes in operating assets and liabilities:    
Accounts receivable (141,000) (1,608,000)
Inventories 74,000 (33,000)
Income tax receivable 254,000 (38,000)
Prepaid expenses and other 263,000 (33,000)
Accounts payable (471,000) (779,000)
Accrued liabilities (570,000) (393,000)
Income tax payable 30,000 (22,000)
Excess tax benefit from stock option exercises (3,000)  
Deferred revenue 1,009,000 670,000
Net cash provided by (used in) operating activities 1,723,000 (1,309,000)
Investing Activities:    
Purchases of property and equipment (101,000) (163,000)
Purchases of investments (3,439,000)  
Proceeds from sale/maturity of investments 3,332,000  
Acquisition of selling rights and other   (542,000)
Proceeds received from sale of property and equipment   14,000
Net cash used in investing activities (208,000) (691,000)
Financing Activities:    
Proceeds from issuance of common stock, net 56,000 178,000
Excess tax benefit from stock option exercises 3,000  
Repurchase of common stock, net (99,000) (455,000)
Net cash used in financing activities (40,000) (277,000)
Increase (decrease) in cash and cash equivalents 1,475,000 (2,277,000)
Cash and cash equivalents at beginning of period 7,237,000 21,763,000
Cash and cash equivalents at end of period 8,712,000 19,486,000
Supplemental disclosures for cash flow information:    
Cash paid during the year for income taxes $ 13,000 $ 247,000