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)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Asset Impairment Charges, Total $ 113,000 $ 11,200,000 $ 3,400,000 $ 20,000,000.0  
Real Estate Owned, Amount of Loss at Acquisition 115,000 $ 86,000 1,100,000 $ 2,500,000  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure     72,000   $ 0
Mortgage Loans in Process of Foreclosure, Amount 150,000   150,000   0
Liabilities, Total 13,487,935,000   13,487,935,000   10,939,802,000 [1]
Fair Value, Recurring [Member]          
Liabilities, Total 0   0   0
Fair Value, Nonrecurring [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 8.00%   8.00%   5.00%
Maximum [Member]          
Impaired Loans, Fair Value Adjustment, Percent 60.00%   60.00%   56.00%
Real Estate Owned, Fair Value Adjustment, Percent 25.00%   25.00%   27.00%
Weighted Average [Member]          
Impaired Loans, Fair Value Adjustment, Percent 23.80%   23.80%   22.30%
Real Estate Owned, Fair Value Adjustment, Percent 10.00%   10.00%   12.50%
Corporate Debt Securities [Member] | Weighted Average Value [Member] | Fair Value, Inputs, Level 3 [Member]          
Debt Securities, Available-for-sale, Measurement Input 0.04   0.04    
[1] Derived from audited financial statements.