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Note 4 - Allowance for Loan Losses (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Financing Receivable, Troubled Debt Restructuring $ 6,000 $ 6,000 $ 360
Financing Receivable, Modifications, Number of Contracts   2  
Allowance for Loan and Lease Losses, Period Increase (Decrease), Total     0
Financing Receivable, Deferred Payments 1,200 $ 1,200  
Financing Receivable, Modifications, Interest Only Payments $ 14,300 14,300  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default   0 0
Financing Receivable Non-accrual Loans Excluded from Impaired Loan Disclosure   0 0
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans   271 $ 96
Minimum [Member]      
Financing Receivable, Modifications, Interest Only Payments, Period (Month) 6 months    
Maximum [Member]      
Financing Receivable, Modifications, Interest Only Payments, Period (Month) 24 months    
TDR Loans [Member]      
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total   $ 2,200  
Secured by Multi-family Residential Properties [Member] | Real Estate 1 [Member]      
Financing Receivable, Modifications, Number of Contracts     1
Performing Financial Instruments [Member]      
Financing Receivable, Troubled Debt Restructuring     $ 0