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Note 6 - Renewable Energy Tax Credit Investment (Details Textual) - USD ($)
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Amortization of Solar Energy Tax Credit Investment $ 299,000 $ 505,000  
Income Tax Credits and Adjustments 304,000 $ 596,000  
Financial Standby Letter of Credit [Member]      
Guarantor Obligations, Maximum Exposure, Undiscounted 4,000,000   $ 276,000
Investment Tax Credit Carryforward [Member]      
Tax Credit, Committed Investment in the Tax Credit Producing Entity $ 4,100,000   $ 401,000