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Note 7 - Stockholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2018 | Dec. 31, 2021
Common Stock, Shares Authorized (in shares) | 80,000,000 |  | 80,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  | $ 0.001
Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member] | Prime Rate [Member] |  |  |
Debt Instrument, Basis Spread on Variable Rate |  | 2.00% |
Convertible Series B Preferred Stock Subject to Mandatory Redemption [Member] |  |  |
Reclassified Stock, Shares (in shares) |  | 583,000 |
Reclassified Stock, Value |  | $ 1,800 |
Debt Instrument, Interest Rate, Effective Percentage | 9.50% |  |
Financial Instruments Subject to Mandatory Redemption, Settlement Terms, Share Value, Amount, Total | $ 4,100 |  | $ 3,800
Series B Preferred Stock [Member] |  |  |
Preferred Units, Authorized (in shares) | 65,000,000 |  |
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ 0.001 |  |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) | 10 |  |
Preferred Stock, Dividend Rate, Percentage | 5.00% |  |
Dividends, Preferred Stock, Total | $ 0 |  |
Preferred Stock, Liquidation Preference Per Share (in dollars per share) | $ 3.00 |  |

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