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Note 4 - Loan Receivables and Allowance for Loan and Lease Losses (Details Textual)
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Oct. 01, 2021
Jan. 01, 2021
Dec. 31, 2020
Payments to Acquire Loans Receivable     $ 98,720,000 $ 44,783,000        
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 $ 115,000 $ 154,000 $ 221,000 $ 409,000        
Maximum Period for Charged Off of Consumer Installment Loans (Day)     180 days          
Financing Receivable, Modifications, Number of Contracts   0 1 0        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0   0          
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend $ 0   $ 0   $ 0      
Number of Impaired Loans 36   36   34      
Impaired Financing Receivable, Recorded Investment $ 24,000,000.0   $ 24,000,000.0          
Number of Impaired Loans, Individually Evaluated for Impairment 25   25   23      
Financing Receivable, Individually Evaluated for Impairment $ 23,500,000   $ 23,500,000   $ 23,200,000      
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment $ 2,900,000   $ 2,900,000   $ 2,300,000      
Number of Impaired Loans, Collectively Evaluated for Impairment 11   11   11      
Financing Receivable, Collectively Evaluated for Impairment $ 532,000   $ 532,000   $ 590,000      
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment $ 5,000   $ 5,000   7,000      
Impaired Financing Receivable, Non-Performing Loans, Discount to Appraisal Value, Percent 5.80%   5.80%          
Impaired Financing Receivable, Non-Performing Loans, Discount of Appraisal Value, Selling Costs, Percent 8.00%   8.00%          
SBA Loans [Member]                
Loans and Leases Receivable, Net Amount $ 30,100,000   $ 30,100,000   27,100,000      
Percentage of Principal Balance Guaranteed           75.00% 90.00% 75.00%
Transfer of Loans Held-for-sale to Portfolio Loans 72,000 $ 0 72,000 $ 281,000        
SBA CARES Act Paycheck Protection Program [Member]                
Loans and Leases Receivable, Net Amount 194,000   194,000   919,000      
Syndicated and Leveraged Loans [Member]                
Loans and Leases Receivable, Net Amount 16,400,000   16,400,000   $ 19,600,000      
Non-Accrual Loans [Member]                
Impaired Financing Receivable, Interest Income, Cash Basis Method 114,000 77,000 $ 204,000 121,000        
Commercial Real Estate Portfolio Segment [Member]                
Maximum Percentage of Credit Extension Based on Market Value of Collateral     75.00%          
Payments to Acquire Loans Receivable 0 0 $ 20,700,000 0        
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   26,700,000 $ 0 42,700,000        
Consumer Portfolio Segment [Member] | Unsecured Loans [Member]                
Payments to Acquire Loans Receivable 32,000,000.0   50,300,000          
Consumer Portfolio Segment [Member] | Home Equity Lines of Credit [Member]                
Payments to Acquire Loans Receivable $ 27,700,000   $ 27,700,000          
Consumer Portfolio Segment [Member] | Education Loans [Member]                
Payments to Acquire Loans Receivable   $ 2,100,000   $ 2,100,000        
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