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Note 8 - Fair Value of Financial Instruments - SBA Servicing Assets Sensitivity Analysis (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Jun. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Fair Value of SBA Servicing Asset $ 4,634 $ 4,447 $ 4,604 $ 4,504 $ 4,593 $ 4,785
Composition of SBA loans serviced for others 100.00% 100.00%        
Weighted Average Remaining Term (in years) (Year) 20 years 3 months 18 days 20 years 8 months 12 days        
Prepayment Speed 13.60% 13.53%        
Effect on fair value of a 10% increase $ (167) $ (175)        
Effect on fair value of a 20% increase $ (323) $ (338)        
Weighted Average Discount Rate 10.00% 10.75%        
Effect on fair value of a 10% increase $ (151) $ (154)        
Effect on fair value of a 20% increase $ (293) $ (298)        
Fixed Rate SBA Loans [Member]            
Composition of SBA loans serviced for others 2.00% 2.00%        
Adjustable Rate SBA Loans [Member]            
Composition of SBA loans serviced for others 98.00% 98.00%