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Note 5 - Investments in Affordable Housing and Alternative Energy Partnerships (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Investments in Affordable Housing and Alternative Energy Partnerships $ 289,600 $ 315,700  
Number of Limited Partnerships Deemed to be Variable Interest Entities 11    
Increase in Total Assets and Liabilities from Consolidating Affordable Housing Equity Interest $ 26,000 25,300  
Alternative Energy Tax Credit Partnership Investments, Net 12,044 19,943  
Alternative Energy Tax Credit Partnership Investments, Held in Escrow 300 6,400  
Asset Impairment Charges 9,909 4,296 $ 4,145
Affordable Housing Limited Partnerships [Member]      
Asset Impairment Charges 6,100 $ 7,700  
Domestic Tax Jurisdiction [Member]      
Remaining and Future Available Tax Credit 252,400    
State and Local Jurisdiction [Member]      
Remaining and Future Available Tax Credit $ 5,100