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Note 16 - Income Tax (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Deferred Tax Liabilities, Net $ 694 $ 735
Undistributed Earnings of Foreign Subsidiaries 6,500 $ 1,300
Alcohol and Cellulosic Biofuel Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 1,500  
Investment Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 3,400  
Carbon Oxide Sequestration Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 9,300  
Research Tax Credit Carryforward [Member]    
Tax Credit Carryforward, Amount 300  
Domestic Tax Jurisdiction [Member]    
Operating Loss Carryforwards 323,000  
Operating Loss Carryforwards Subject to Expiration 188,000  
Operating Loss Carryforwards Not Subject to Expiration $ 135,000  
Domestic Tax Jurisdiction [Member] | Minimum [Member]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2027  
Domestic Tax Jurisdiction [Member] | Maximum [Member]    
Operating Loss Carryforwards, Expiration Date Dec. 31, 2043  
State and Local Jurisdiction [Member]    
Operating Loss Carryforwards $ 408,000  
Operating Loss Carryforwards Subject to Expiration $ 408,000  
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