Quarterly report [Sections 13 or 15(d)]

Note 12 - Fair Value Measurement (Details Textual)

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Note 12 - Fair Value Measurement (Details Textual)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Asset, Impairment Loss $ 9,500,000 $ 1,200,000 $ 19,200,000 $ 3,600,000  
Gains (Losses) on Sales of Other Real Estate $ (61,000) $ (17,000) $ (83,000) $ 301,000  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Number of Loans     3   5
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     $ 2,000,000   $ 2,500,000
Number of Mortgage Loans in Process of Foreclosure 7   7   1
Mortgage Loans in Process of Foreclosure, Amount $ 1,700,000   $ 1,700,000   $ 171,000
Liabilities 16,367,080,000   $ 16,367,080,000   15,876,843,000
Fair Value, Number of Transfers Between Levels     0    
Fair Value, Recurring [Member]          
Liabilities $ 0   $ 0   $ 0
Minimum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 0.00%   0.00%   0.00%
Real Estate Owned, Fair Value Adjustment, Percent 10.00%   10.00%   10.00%
Maximum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 80.00%   80.00%   70.00%
Real Estate Owned, Fair Value Adjustment, Percent 87.00%   87.00%   27.00%
Weighted Average [Member]          
Impaired Loans, Fair Value Adjustment, Percent 30.30%   30.30%   17.10%
Real Estate Owned, Fair Value Adjustment, Percent 28.10%   28.10%   23.50%