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Note 4 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
May 06, 2020
USD ($)
Apr. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loans and Leases Receivable, Deferred Income, Total $ 3,100,000       $ 2,600,000  
Loans and Leases Receivable, Allowance, Ending Balance 7,220,000 $ 6,639,000     6,556,000 $ 6,508,000
Financing Receivable, Troubled Debt Restructuring 354,000       409,000  
Allowance for Losses Allocated to Loans Classified as TDRS $ 2,000       5,000  
Financing Receivable, Modifications, Number of Contracts 0          
Financing Receivable, Number of Payment Deferrals 76          
Financing Receivable, Principal and Interest Deferred Payments $ 15,100,000          
Financing Receivable, Percent of Outstanding Loan Balance Deferred 2.00%          
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0        
Subsequent Event [Member]            
Financing Receivable, Number of Payment Deferrals     391 391    
Financing Receivable, Principal and Interest Deferred Payments     $ 78,700,000 $ 78,700,000    
Financing Receivable, Percent of Outstanding Loan Balance Deferred     10.00%      
Commercial Real Estate Portfolio Segment [Member]            
Loans and Leases Receivable, Allowance, Ending Balance $ 3,434,000 $ 3,043,000     $ 2,898,000 $ 3,106,000
Financing Receivable, Troubled Debt Restructuring   $ 74,000        
Financing Receivable, Modifications, Number of Contracts   1        
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