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STATEMENTS OF CASH FLOWS - USD ($)
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Operating Activities:    
Net loss $ (1,191,000) $ (322,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 335,000 460,000
Changes in allowance for doubtful accounts 48,000 (30,000)
Deferred income tax benefit (153,000) 0
Stock-based compensation expense 147,000 26,000
Changes in operating assets and liabilities:    
Accounts receivable 1,657,000 2,155,000
Inventories (7,000) (97,000)
Income tax receivable (377,000) (259,000)
Prepaid expenses and other 49,000 38,000
Accounts payable (384,000) (1,243,000)
Accrued liabilities (180,000) (1,072,000)
Income tax payable 0 (175,000)
Deferred revenue 630,000 197,000
Net cash provided by (used in) operating activities 574,000 (322,000)
Investing Activities:    
Purchases of property and equipment (285,000) (318,000)
Proceeds from sale or maturity of investments 0 1,855,000
Net cash provided by (used in) investing activities (285,000) 1,537,000
Financing Activities:    
Cash dividends paid ($0.70 per share) (8,163,000) 0
Proceeds from issuance of common stock, net 0 45,000
Repurchase of common stock, net 0 (106,000)
Net cash used in financing activities (8,163,000) (61,000)
Increase (decrease) in cash and cash equivalents (7,874,000) 1,154,000
Cash and cash equivalents at beginning of period 12,267,000 8,523,000
Cash and cash equivalents at end of period 4,393,000 9,677,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes 2,000 207,000
Non-cash investing and financing activities:    
Purchases of property and equipment included in accounts payable $ 67,000 $ 0