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STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Operating Activities:    
Net income $ 1,534,000 $ 211,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 1,156,000 1,177,000
Changes in allowance for doubtful accounts (10,000) 72,000
Deferred income tax expense 29,000 57,000
Stock-based compensation 353,000 403,000
Gain on sale of property and equipment (30,000) (3,000)
Changes in operating assets and liabilities:    
Accounts receivable (890,000) (3,277,000)
Inventories 132,000 (216,000)
Income tax receivable 286,000 (276,000)
Prepaid expenses and other 224,000 (424,000)
Accounts payable (73,000) 452,000
Accrued liabilities 291,000 177,000
Income tax payable 170,000 80,000
Accrued income taxes 42,000 28,000
Excess tax deficiency (benefit) from stock-based awards 12,000 (20,000)
Deferred revenue (8,000) (89,000)
Net cash provided by (used in) operating activities 3,218,000 (1,648,000)
Investing Activities:    
Purchases of property and equipment (444,000) (427,000)
Acquisition of selling rights and other   (542,000)
Purchases of investments (5,441,000) (12,474,000)
Proceeds received from sale or maturity of investments 5,649,000 2,765,000
Proceeds received from sale of property and equipment 30,000 14,000
Net cash used in investing activities (206,000) (10,664,000)
Financing Activities:    
Proceeds from issuance of common stock, net 48,000 216,000
Excess tax (deficiency) benefit from stock-based awards (12,000) 20,000
Repurchase of common stock, net (1,762,000) (2,450,000)
Net cash used in financing activities (1,726,000) (2,214,000)
Increase (decrease) in cash and cash equivalents 1,286,000 (14,526,000)
Cash and cash equivalents at beginning of year 7,237,000 21,763,000
Cash and cash equivalents at end of year 8,523,000 7,237,000
Supplemental disclosures for cash flow information:    
Cash paid during the year for income taxes 653,000 $ 482,000
Non-cash financing activities:    
Purchases of property and equipment included in accounts payable 340,000  
Tenant allowance in other assets and deferred rent $ 275,000