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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Activities:    
Net income (loss) $ 164,000 $ (1,191,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation and amortization 287,000 335,000
Changes in allowance for doubtful accounts 4,000 48,000
Deferred income tax benefit 0 (153,000)
Stock-based compensation expense 67,000 147,000
Changes in operating assets and liabilities:    
Accounts receivable 2,960,000 1,657,000
Inventories (184,000) (7,000)
Income tax receivable 65,000 (377,000)
Prepaid expenses and other 39,000 49,000
Accounts payable (358,000) (384,000)
Accrued liabilities (642,000) (180,000)
Accrued income taxes 8,000 0
Deferred revenue 299,000 630,000
Net cash provided by operating activities 2,709,000 574,000
Investing Activities:    
Purchases of property and equipment (194,000) (285,000)
Net cash used in investing activities (194,000) (285,000)
Financing Activities:    
Cash dividends paid ($0.70 per share) 0 (8,163,000)
Proceeds from issuance of common stock, net 49,000 0
Net cash provided by (used in) financing activities 49,000 (8,163,000)
Increase (decrease) in cash and cash equivalents 2,564,000 (7,874,000)
Cash and cash equivalents at beginning of period 4,695,000 12,267,000
Cash and cash equivalents at end of period 7,259,000 4,393,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes 0 2,000
Non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable $ 93,000 $ 67,000