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Note 4 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Loans and Leases Receivable, Deferred Income $ 3,200,000   $ 3,300,000    
Loans and Leases Receivable, Net of Deferred Income 805,200,000   790,403,000    
Loans and Leases Receivable, Allowance, Ending Balance 10,268,000 $ 9,685,000 10,393,000 $ 9,580,000  
Financing Receivable, Troubled Debt Restructuring $ 336,000   346,000    
Financing Receivable, Modifications, Number of Contracts 0 0      
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0      
Financing Receivable, Number of Payment Deferrals 1        
Financing Receivable, Principal and Interest Deferred Payments $ 3,900,000        
United American Savings Bank [Member]          
Loans and Leases Receivable, Allowance, Ending Balance 0        
Northern Hancock Bank & Trust Co. [Member]          
Loans and Leases Receivable, Allowance, Ending Balance 0        
Community First [Member]          
Loans and Leases Receivable, Allowance, Ending Balance 0        
Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income 110,298,000   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 61,381,000   65,877,000    
Commercial Portfolio Segment [Member] | Extended Maturity [Member]          
Allowance for Losses Allocated to Loans Classified as TDRS 7,000   6,000    
Commercial Portfolio Segment [Member] | Other Loans [Member]          
Loans and Leases Receivable, Net of Deferred Income 61,381,000   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 945,000   1,200,000    
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums 22,000       $ 3,700,000
Amortization of Deferred Loan Origination Fees, Net $ 19,000   $ 2,400,000 $ 1,300,000