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Note 13 - Income Tax (Details Textual) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred Tax Liabilities, Net, Total | $ 735 | $ 810
Undistributed Earnings of Foreign Subsidiaries | 1,300 | $ 2,500
Alcohol and Cellulosic Biofuel Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 1,500 |
Carbon Oxide Sequestration Credit Carryforward [Member] |  |
Tax Credit Carryforward, Amount | 6,700 |
Domestic Tax Authority [Member] |  |
Operating Loss Carryforwards | $ 253,000 |
Domestic Tax Authority [Member] | Minimum [Member] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2027 |
Domestic Tax Authority [Member] | Maximum [Member] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2043 |
State and Local Jurisdiction [Member] |  |
Operating Loss Carryforwards | $ 336,000 |
State and Local Jurisdiction [Member] | Minimum [Member] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2027 |
State and Local Jurisdiction [Member] | Maximum [Member] |  |
Operating Loss Carryforwards, Expiration Date | Dec. 31, 2042 |

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