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Note 4 - Loans Receivable and Related Allowance for Loan Losses (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Loans and Leases Receivable, Deferred Income, Total $ 2,300,000   $ 2,300,000     $ 2,200,000    
Loans and Leases Receivable, Allowance, Ending Balance 6,509,000 $ 6,360,000 6,509,000 $ 6,360,000 $ 6,580,000 6,508,000 $ 6,118,000 $ 6,127,000
Financing Receivable, Troubled Debt Restructuring 433,000   433,000     394,000    
Allowance for Losses Allocated to Loans Classified as TDRS $ 4,000   $ 4,000     12,000    
Financing Receivable, Modifications, Number of Contracts 0 0   0        
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0 0 0 0        
Residential Portfolio Segment [Member]                
Loans and Leases Receivable, Allowance, Ending Balance $ 2,241,000 $ 2,161,000 $ 2,241,000 $ 2,161,000 $ 2,225,000 $ 2,198,000 $ 2,033,000 $ 2,090,000
Financing Receivable, Troubled Debt Restructuring 72,000   72,000          
Allowance for Losses Allocated to Loans Classified as TDRS 0   $ 0          
Financing Receivable, Modifications, Number of Contracts     1          
United American Savings Bank [Member]                
Loans and Leases Receivable, Allowance, Ending Balance 0   $ 0          
Community First [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