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CONDENSED STATEMENTS OF CASH FLOWS - USD ($)
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Operating Activities:    
Net loss $ (2,635,000) $ (1,584,000)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Depreciation and amortization 267,000 742,000
Impairment loss 159,000 0
Changes in allowance for doubtful accounts 2,000 (2,000)
Deferred income tax benefit 0 (388,000)
Stock-based compensation expense 108,000 277,000
Accrued interest on held to maturity investments 0 (33,000)
Changes in operating assets and liabilities:    
Accounts receivable 2,238,000 2,517,000
Inventories 10,000 (8,000)
Income tax receivable (121,000) (3,000)
Prepaid expenses and other (109,000) 92,000
Accounts payable (851,000) (459,000)
Accrued liabilities (67,000) (1,924,000)
Income tax payable 17,000 15,000
Deferred revenue 430,000 134,000
Net cash provided by (used in) operating activities (552,000) (624,000)
Investing Activities:    
Purchases of property and equipment (44,000) (358,000)
Purchase of investments 0 (4,981,000)
Net cash used in investing activities (44,000) (5,339,000)
Financing Activities:    
Proceeds from issuance of common stock 20,000 108,000
Repurchase of common stock upon vesting of restricted stock awards 0 (9,000)
Cash dividends paid ($0.70 per share) (14,000) (14,000)
Proceeds from PPP loan 1,054,000 0
Net cash provided by financing activities 1,060,000 85,000
Increase (decrease) in cash and cash equivalents 464,000 (5,878,000)
Cash and cash equivalents at beginning of period 7,510,000 10,160,000
Cash and cash equivalents at end of period 7,974,000 4,282,000
Supplemental disclosures for cash flow information:    
Cash paid during the period for income taxes $ (107,000) $ 6,000