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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