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STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating activities:    
Net income (loss) $ 10,046,000 $ (3,534,000)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation and amortization 59,000 60,000
Gain on sale of property and equipment 0 (6,000)
Changes in allowance for doubtful accounts (251,000) 87,000
Stock-based compensation expense 123,000 232,000
Gain on forgiveness of debt and accrued interest 0 (1,062,000)
Changes in operating assets and liabilities:    
Accounts receivable (59,000) 523,000
Inventories (10,000) 66,000
Income taxes receivable (24,000) 237,000
Prepaid expenses and other 618,000 (392,000)
Accounts payable 126,000 (572,000)
Accrued liabilities (892,000) 665,000
Accrued income taxes (658,000) 34,000
Deferred revenue 1,585,000 662,000
Net cash provided by (used in) operating activities 10,663,000 (3,000,000)
Investing activities:    
Purchases of property and equipment (29,000) (106,000)
Sale of property and equipment 0 16,000
Net cash used in investing activities (29,000) (90,000)
Financing activities:    
Proceeds from issuance of common stock, net 39,000 27,000
Cash dividends paid ($0.70 per share) 0 (14,000)
Repurchase of common stock upon vesting of restricted stock awards and vesting of restricted stock units 0 (200,000)
Net cash provided by (used in) financing activities 39,000 (187,000)
Increase (decrease) in cash and cash equivalents and restricted cash 10,673,000 (3,277,000)
Cash and cash equivalents and restricted cash at beginning of year 3,851,000 7,128,000
Cash and cash equivalents and restricted cash at end of year 14,524,000 3,851,000
Supplemental disclosures for cash flow information:    
Cash paid during the year for income taxes 464,000 230,000
Non-cash investing and financing activities:    
Operating lease right-of-use asset obtained in exchange for lease obligations 38,000 219,000
Purchase of property and equipment included in accounts payable $ 1,000 $ 13,000