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Note 4 - Allowance for Loan Losses (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended
Apr. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Troubled Debt Restructuring   $ 350   $ 360
Financing Receivable, Deferred Payments   61,600    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   $ 0 $ 0  
Subsequent Event [Member]        
Financing Receivable, Deferred Payments $ 171,000      
Financing Receivable, Deferred Payments During the Period $ 109,400      
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]        
Financing Receivable, Modifications, Number of Contracts   1    
Performing Financial Instruments [Member]        
Financing Receivable, Troubled Debt Restructuring   $ 0   $ 0