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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Sep. 30, 2021
USD ($)
Oct. 09, 2020
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Payments to Acquire Loans Receivable       $ 80,201,000 $ 31,525,000    
Maximum Period of Credit Extension of Construction Loans (Month)       18 months      
Loans Receivable, Term to Reset to FHLB Rate (Year)       5 years      
Period for Charged Off of Open-End Credits (Day)       180 days      
Period for Charged Off of Close-End Credits (Day)       120 days      
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 230,000   $ 216,000 $ 689,000 $ 691,000    
Maximum Period for Charged Off of Consumer Installment Loans (Day)           180 days  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0   0 0    
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0     $ 0   $ 0  
Financing Receivable, Principal and Interest Deferred Payments     232,700,000   $ 232,700,000    
Financing Receivable, Number Of Loans, Delinquent on Payments 14     14      
Financing Receivable, Loans, Delinquent on Payments $ 6,800,000     $ 6,800,000      
Financing Receivable, Number of Payment Deferrals 3     3      
Financing Receivable, Deferred Payments $ 7,300,000     $ 7,300,000      
Number of Impaired Loans 36     36   26  
Impaired Financing Receivable, Recorded Investment, Total $ 28,800,000     $ 28,800,000   $ 24,400,000  
Impaired Financing Receivable, Related Allowance $ 1,800,000     $ 1,800,000   $ 1,400,000  
Number of Impaired Loans, Individually Evaluated for Impairment 25     25      
Number of Impaired Loans, Collectively Evaluated for Impairment 11     11      
Financing Receivable, Collectively Evaluated for Impairment $ 100,000     $ 100,000      
Impaired Financing Receivable, Non-Performing Loans, Discount to Appraisal Value, Percent 8.00%     8.00%   5.80%  
SBA Loans [Member]              
Transfer of Loans Held-for-sale to Portfolio Loans       $ 281,000 9,542,000    
SBA Loans [Member] | Minimum [Member]              
Percentage of Principal Balance Guaranteed             75.00%
SBA Loans [Member] | Maximum [Member]              
Percentage of Principal Balance Guaranteed             90.00%
SBA CARES Act Paycheck Protection Program [Member]              
Loans and Leases Receivable, Net Amount, Total $ 1,900,000     1,900,000      
Syndicated and Leveraged Loans [Member]              
Loans and Leases Receivable, Net Amount, Total 27,800,000     27,800,000   $ 55,000,000.0  
Non-Accrual Loans [Member]              
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total 174,000   21,000 $ 313,000 106,000    
Commercial Real Estate Portfolio Segment [Member]              
Maximum Percentage of Credit Extension Based on Market Value of Collateral       75.00%      
Multi-family Real Estate [Member]              
Maximum Percentage of Credit Extension Based on Market Value of Collateral       80.00%      
Construction Portfolio Segment [Member]              
Maximum Percentage of Credit Extension Based on Market Value of Collateral       65.00%      
Residential Portfolio Segment [Member]              
Payments to Acquire Loans Receivable 29,600,000   2,500,000 $ 72,300,000 $ 16,600,000    
Consumer Portfolio Segment [Member] | Education Loans [Member]              
Payments to Acquire Loans Receivable 5,800,000   $ 0 $ 7,900,000     $ 14,900,000
Construction to Permanent Portfolio Segment [Member]              
Loans Receivable, Term (Year)       10 years      
Commercial and Industrial Loans [Member]              
Loans and Leases Receivable, Net Amount, Total $ 26,800,000     $ 26,800,000   $ 21,600,000