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Note 13 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Tax Expense (Benefit), Total | $ 48 | $ 38
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | (4,055) | 992
Deferred Tax Assets, Valuation Allowance, Total | 70,066 | 74,121
Operating Loss Carryforwards, Subject to Expiration | 260,598 | $ 227,781
Operating Loss Carry Forwards Annual Limit | $ 14,284 |
Rights [Member] |  |
Term of Extended Rights Plan (Year) | 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) | 0.001 |
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ 4.25 |
Class of Warrant or Right Current Beneficial Ownership Percentage That Will Not Trigger Preferred Share Purchase Rights | 4.90% |

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- Definition Subsequent to the adoption of a shareholders rights plan, this value represents the threshold percentage of beneficial ownership of common stock acquired by any person or group without approval of the board of directors, or additional shares acquired by any shareholder already holding such percentage of common stock, upon which a preferred share purchase rights offering would occur, which would significantly dilute the ownership of the acquirer. + References No definition available. + Details
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