Quarterly report pursuant to Section 13 or 15(d)

Note 11 - Fair Value Measurement (Details Textual)

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Note 11 - Fair Value Measurement (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Asset Impairment Charges $ 7,200,000 $ 1,400,000 $ 13,500,000 $ 3,200,000  
Real Estate Owned, Amount of Loss at Acquisition 33,000   28,000 $ 232,000  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     95,000   $ 248,000
Mortgage Loans in Process of Foreclosure, Amount 1,800,000   1,800,000   0
Liabilities, Total 14,642,948,000   14,642,948,000   13,297,857,000 [1]
Fair Value, Recurring [Member]          
Liabilities, Total $ 0   $ 0   $ 0
Minimum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 0.00%   0.00%   0.00%
Real Estate Owned, Fair Value Adjustment, Percent 26.00%   26.00%   0.00%
Maximum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 65.00%   65.00%   82.00%
Real Estate Owned, Fair Value Adjustment, Percent 100.00%   100.00%   100.00%
Weighted Average [Member]          
Impaired Loans, Fair Value Adjustment, Percent 25.00%   25.00%   19.50%
Real Estate Owned, Fair Value Adjustment, Percent 42.00%   42.00%   53.30%
[1] derived from audited financial statements.