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Note 10 - Income Taxes (Details Textual) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 03, 2022 | Feb. 07, 2019 | Mar. 31, 2022 USD ($) | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) $ / shares shares
Income Tax Expense (Benefit), Total |  |  | $ 7 | $ 32 | $ (1) |
Operating Loss Carryforwards, Total |  |  |  |  |  | $ 277,310
Operating Loss Carryforwards, Subject to Expiration |  |  |  |  |  | $ 227,781
Operating Loss Carry Forwards Annual Limit |  |  | 14,284 |  | 14,284 |
Unrecognized Tax Benefits, Ending Balance |  |  | 0 |  | 0 |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total |  |  | $ 0 |  | $ 0 |
Rights [Member] |  |  |  |  |  |
Term of Extended Rights Plan (Year) | 3 years | 3 years |  |  |  |
Threshold Percentage of Beneficial Ownership for Significant Dilution in Ownership Interest |  |  |  |  |  | 4.90%
Class of Warrant or Right Number of Rights Per Common Stock Share |  |  |  |  |  | 1
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares) | shares |  |  |  |  |  | 0.001
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares |  |  |  |  |  | $ 7.26
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights |  |  |  |  |  | 4.90%

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