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STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating Activities:    
Net income (loss) $ (409,000) $ 346,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 785,000 567,000
Changes in allowance for doubtful accounts 19,000 (32,000)
Deferred income tax expense   119,000
Stock-based compensation expense 108,000 278,000
Changes in operating assets and liabilities:    
Accounts receivable 1,589,000 (141,000)
Inventories (179,000) 74,000
Income tax receivable (464,000) 254,000
Prepaid expenses and other (36,000) 263,000
Accounts payable (973,000) (471,000)
Accrued liabilities (947,000) (570,000)
Income tax payable (184,000) 30,000
Excess tax benefit from stock-based awards   (3,000)
Deferred revenue 232,000 1,009,000
Net cash provided by (used in) operating activities (459,000) 1,723,000
Investing Activities:    
Purchases of property and equipment (393,000) (101,000)
Purchases of investments   (3,439,000)
Proceeds from sale or maturity of investments 3,288,000 3,332,000
Net cash provided by (used in) investing activities 2,895,000 (208,000)
Financing Activities:    
Proceeds from issuance of common stock, net 60,000 56,000
Excess tax benefit from stock-based awards   3,000
Repurchase of common stock, net (247,000) (99,000)
Net cash used in financing activities (187,000) (40,000)
Increase in cash and cash equivalents 2,249,000 1,475,000
Cash and cash equivalents at beginning of period 8,523,000 7,237,000
Cash and cash equivalents at end of period 10,772,000 8,712,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes $ 238,000 $ 13,000