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 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 20, 2021
Jun. 30, 2020
Dec. 31, 2020
Asset Impairment Charges, Total $ 1,400,000 $ 3,800,000 $ 3,300,000   $ 8,800,000  
Real Estate Owned, Amount of Loss at Acquisition 540,000 $ 1,300,000 697,000   $ 1,900,000  
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate, Foreclosure       $ 222,000   $ 209,000
Mortgage Loans in Process of Foreclosure, Amount 111,000   111,000     0
Liabilities, Total 12,134,035,000   12,134,035,000     10,939,802,000 [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 10.00%   10.00%     5.00%
Maximum [Member]            
Impaired Loans, Fair Value Adjustment, Percent 64.00%   64.00%     56.00%
Real Estate Owned, Fair Value Adjustment, Percent 25.00%   25.00%     27.00%
Weighted Average [Member]            
Impaired Loans, Fair Value Adjustment, Percent 24.02%   24.02%     22.30%
Real Estate Owned, Fair Value Adjustment, Percent 15.50%   15.50%     12.50%
[1] derived from audited financial statements.