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Note 4 - Loan Receivables and Allowance for Loan and Lease Losses (Details Textual)
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Oct. 01, 2021
Jan. 01, 2021
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net $ 0 $ 0      
Deteriorated Loans Transferred in, Debt Securities, Accreditable Yield, Period Increase (Decrease), Total 0 2,000 $ 47,000    
Payments to Acquire Loans Receivable $ 89,338,000 32,785,000 54,604,000    
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 $ 802,000 $ 904,000 $ 302,000    
Maximum Period for Charged Off of Consumer Installment Loans (Day) 180 days        
Financing Receivable, Modifications, Number of Contracts 0 6 2    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0        
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0 $ 0      
Financing Receivable, Principal and Interest Deferred Payments $ 232,700,000        
Financing Receivable, Number of Payment Deferrals 7        
Financing Receivable, Deferred Payments $ 6,500,000        
Impaired Financing Receivable, Recorded Investment, Total 23,800,000 24,400,000      
Impaired Financing Receivable, Related Allowance $ 2,300,000 $ 1,400,000      
Number of Impaired Loans 34 26      
Number of Impaired Loans, Individually Evaluated for Impairment 23        
Number of Impaired Loans, Collectively Evaluated for Impairment 11        
Financing Receivable, Collectively Evaluated for Impairment $ 590,000        
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment $ 7,000        
Impaired Financing Receivable, Non-Performing Loans, Discount to Appraisal Value, Percent 5.80%        
Impaired Financing Receivable, Non-Performing Loans, Discount of Appraisal Value, Selling Costs, Percent 8.00%        
SBA Loans [Member]          
Percentage of Principal Balance Guaranteed   75.00%   75.00% 90.00%
SBA CARES Act Paycheck Protection Program [Member]          
Loans and Leases Receivable, Net Amount, Total $ 919,000        
Syndicated and Leveraged Loans [Member]          
Loans and Leases Receivable, Net Amount, Total 19,600,000 $ 55,000,000.0      
Non-Accrual Loans [Member]          
Impaired Financing Receivable, Interest Income, Cash Basis Method, Total $ 377,000 $ 156,000 $ 671,000    
Commercial Real Estate Portfolio Segment [Member]          
Maximum Percentage of Credit Extension Based on Market Value of Collateral 75.00%        
Financing Receivable, Modifications, Number of Contracts   2 2    
Multi-family Real Estate [Member]          
Maximum Percentage of Credit Extension Based on Market Value of Collateral 80.00%        
Construction Portfolio Segment [Member]          
Percentage of Maximum Loan to Value 75.00%        
Residential Portfolio Segment [Member]          
Payments to Acquire Loans Receivable $ 72,300,000 $ 17,900,000      
Consumer Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts   3 0    
Consumer Portfolio Segment [Member] | Unsecured Loans [Member]          
Payments to Acquire Loans Receivable 17,000,000.0        
Consumer Portfolio Segment [Member] | Education Loans [Member]          
Payments to Acquire Loans Receivable $ 0 $ 14,900,000      
Construction to Permanent Portfolio Segment [Member] | Minimum [Member]          
Loans Receivable, Term (Year) 20 years        
Construction to Permanent Portfolio Segment [Member] | Maximum [Member]          
Loans Receivable, Term (Year) 25 years        
Commercial and Industrial Loans [Member]          
Loans and Leases Receivable, Net Amount, Total $ 27,100,000 $ 21,600,000