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Note 3 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
12 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Loans and Leases Receivable, Deferred Income, Total   $ 3,300,000 $ 2,500,000  
Loans and Leases Receivable, Net of Deferred Income, Total   790,403,000 809,918,000  
Loans and Leases Receivable, Allowance, Ending Balance   10,393,000 9,580,000 $ 6,556,000
Financing Receivable, Troubled Debt Restructuring   346,000 396,000  
Allowance for Losses Allocated to Loans Classified as TDRS   $ 6,000 $ 6,000  
Financing Receivable, Modifications, Number of Contracts   0    
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   0 0  
Financing Receivable, Number of Payment Deferrals   1 31  
Financing Receivable, Principal and Interest Deferred Payments   $ 3,900,000 $ 32,100,000  
United American Savings Bank [Member]        
Loans and Leases Receivable, Allowance, Ending Balance   0 0  
Northern Hancock Bank & Trust Co. [Member]        
Loans and Leases Receivable, Allowance, Ending Balance   0 0  
Community First [Member]        
Loans and Leases Receivable, Allowance, Ending Balance   0 0  
Other Loans [Member]        
Loans and Leases Receivable, Net of Deferred Income, Total   $ 114,429,000 129,174,000  
SBA CARES Act Paycheck Protection Program [Member]        
Financing Receivable, Number of Payment Deferrals   410    
Financing Receivable, Principal and Interest Deferred Payments   $ 110,400,000    
Financing Receivable, Percent of Outstanding Loan Balance Deferred   13.60%    
Commercial Portfolio Segment [Member]        
Loans and Leases Receivable, Net of Deferred Income, Total   $ 65,877,000 89,139,000  
Commercial Portfolio Segment [Member] | Extended Maturity [Member]        
Financing Receivable, Troubled Debt Restructuring     64,000  
Allowance for Losses Allocated to Loans Classified as TDRS   6,000 $ 6,000  
Financing Receivable, Modifications, Number of Contracts     1  
Commercial Portfolio Segment [Member] | Other Loans [Member]        
Loans and Leases Receivable, Net of Deferred Income, Total   65,877,000 $ 89,139,000  
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member] | Other Loans [Member]        
Loans and Leases Receivable, Net of Deferred Income, Total   1,200,000 30,400,000  
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total   1,600,000 2,100,000  
Amortization of Deferred Loan Origination Fees, Net   $ 1,300,000 $ 2,400,000  
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member] | Other Loans [Member] | Forecast [Member]        
Amortization of Deferred Loan Origination Fees, Net $ 41,000