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STATEMENTS OF CASH FLOWS - USD ($)
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Operating Activities:    
Net income $ 907,000 $ 609,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 851,000 824,000
Change in allowance for doubtful accounts (19,000) 34,000
Deferred income tax expense 119,000  
Stock-based compensation 267,000 300,000
Gain on sale of property and equipment (25,000) (14,000)
Changes in operating assets and liabilities:    
Accounts receivable 457,000 (3,379,000)
Inventories 55,000 (89,000)
Income tax receivable 277,000 (1,000)
Prepaid expenses and other 118,000 (526,000)
Accounts payable (379,000) 86,000
Accrued liabilities 498,000 (270,000)
Income tax payable 159,000 236,000
Excess tax benefit from stock options exercises (4,000) (11,000)
Deferred revenue 456,000 441,000
Net cash provided by (used in) operating activities 3,737,000 (1,760,000)
Investing Activities:    
Purchases of property and equipment (137,000) (319,000)
Acquisition of selling rights and other   (542,000)
Purchases of investments (4,513,000) (10,255,000)
Proceeds from sale/maturity of investments 4,308,000 955,000
Proceeds received from sale of property and equipment 25,000 14,000
Net cash used in investing activities (317,000) (10,147,000)
Financing Activities:    
Proceeds from issuance of common stock, net 48,000 199,000
Excess tax benefit from stock options exercises 4,000 11,000
Repurchase of common stock, net (1,614,000) (1,886,000)
Net cash used in financing activities (1,562,000) (1,676,000)
Increase (decrease) in cash and cash equivalents 1,858,000 (13,583,000)
Cash and cash equivalents at beginning of period 7,237,000 21,763,000
Cash and cash equivalents at end of period 9,095,000 8,180,000
Supplemental disclosures for cash flow information:    
Cash paid during the year for income taxes $ 243,000 $ 377,000