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Note 21 - Qualified Affordable Housing Project Investments (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Amortization Method Qualified Affordable Housing Project Investments $ 7,900,000   $ 7,900,000   $ 8,600,000
Qualified Affordable Housing Project Investments, Commitment 2,000,000.0   2,000,000.0   $ 4,200,000
Amortization Method Qualified Affordable Housing Project Investments, Amortization $ 247,000 $ 225,000 $ 740,000 $ 675,000  
Minimum [Member]          
Affordable Housing Tax Credits Commitment, Year to be Paid     2020    
Maximum [Member]          
Affordable Housing Tax Credits Commitment, Year to be Paid     2027