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Note 4 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jan. 01, 2020
USD ($)
Loans and Leases Receivable, Deferred Income $ 3,200,000   $ 3,200,000   $ 3,300,000        
Loans and Leases Receivable, Net of Deferred Income 810,106,000   810,106,000   790,403,000        
Loans and Leases Receivable, Allowance, Ending Balance 10,589,000 $ 9,949,000 10,589,000 $ 9,949,000 10,393,000 $ 9,580,000 $ 10,525,000 $ 9,848,000  
Financing Receivable, Troubled Debt Restructuring 2,100,000   2,100,000   346,000        
Allowance for Losses Allocated to Loans Classified as TDRS $ 117,000   $ 117,000   6,000        
Financing Receivable, Modifications, Number of Contracts 0 0 1 0          
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0          
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 98,405,000   98,405,000   114,429,000        
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 56,026,000   56,026,000   65,877,000        
Commercial Portfolio Segment [Member] | Other Loans [Member]                  
Loans and Leases Receivable, Net of Deferred Income 56,026,000   56,026,000   65,877,000        
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member] | Other Loans [Member]                  
Loans and Leases Receivable, Net of Deferred Income 170,000   170,000   1,200,000        
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums             4,000   $ 3,700,000
Amortization of Deferred Loan Origination Fees, Net     38,000   2,400,000 $ 1,300,000      
Commercial Real Estate Portfolio Segment [Member]                  
Loans and Leases Receivable, Net of Deferred Income 344,716,000   344,716,000   326,341,000        
Loans and Leases Receivable, Allowance, Ending Balance 6,617,000 $ 6,000,000 6,617,000 $ 6,000,000 $ 6,253,000 $ 5,180,000 $ 6,542,000 $ 5,826,000  
Commercial Real Estate Portfolio Segment [Member] | Interest Rate Reduction and Extended Maturity [Member]                  
Loans and Leases Receivable, Allowance, Ending Balance 100,000   100,000            
Financing Receivable, Troubled Debt Restructuring $ 1,800,000   $ 1,800,000