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Note 4 - Loans (Details Textual)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loans and Leases Receivable, Percentage of Outstanding Principal Balance Secured by Owner Occupied Properties 39.00%  
Underwriting Standards, Loan to Value Percentage 80.00%  
Underwriting Standards, Housing Percentage 36.00%  
Underwriting Standards, Total Debt Ratio 42.00%  
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 62,000 $ 68,000
Impaired Financing Receivable, Interest Income, Accrual Method, Total $ 0 $ 0
Financing Receivable, Modifications, Number of Contracts Held 1 4
Financing Receivable, Troubled Debt Restructuring $ 855,000 $ 920,000
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend   0
Allowance for Credit Losses, Trouble Debt Restructurings 680,000 680,000
Financing Receivable, Troubled Debt Restructuring, Postmodification $ 906,000 $ 0
Financing Receivable, Modifications, Number of Contracts 0  
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts 0  
Financing Receivable Modifications, Period Contractually Past Due for Loan to Be Considered in Payment Default   90 days
Loans and Leases Receivable, Minimum Cash Collateral Percent   110.00%
Loans and Leases Receivable, Gross, Total $ 750,985,000 $ 711,902,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 750,985,000 $ 711,902,000
Substandard [Member]    
Financing Receivable Rating Example, Percentage of Loans Classified in Rating Category   40.00%
Loans and Leases Receivable, Gross, Total 3,362,000 $ 3,773,000
Doubtful [Member]    
Financing Receivable Rating Example, Percentage of Loans Classified in Rating Category   25.00%
Unlikely to be Collected Financing Receivable [Member]    
Financing Receivable Rating Example, Percentage of Loans Classified in Rating Category   35.00%
Loans and Leases Receivable, Gross, Total $ 0 $ 0
Minimum [Member]    
Financing Receivable, Rating Example Disbursement to Unsecured Creditors by Illusory Company in Liquidation, Percentage   40.00%
Maximum [Member]    
Financing Receivable, Rating Example Disbursement to Unsecured Creditors by Illusory Company in Liquidation, Percentage   65.00%
Commercial Real Estate Portfolio Segment [Member]    
Loans and Leases Receivable, Gross Carrying Amount As Percentage of Total Loans 81.00%  
Loans and Leases Receivable, Gross, Total $ 607,002,000 $ 554,519,000
Commercial Portfolio Segment [Member]    
Loans and Leases Receivable, Gross Carrying Amount As Percentage of Total Loans 10.00%  
Loans and Leases Receivable, Gross, Total $ 77,704,000 82,252,000
Commercial Portfolio Segment [Member] | Substandard [Member]    
Loans and Leases Receivable, Gross, Total $ 2,194,000 2,100,000
Residential Real Estate and Other Consumer Loans [Member]    
Loans and Leases Receivable, Gross Carrying Amount As Percentage of Total Loans 5.00%  
Agriculture [Member]    
Loans and Leases Receivable, Gross Carrying Amount As Percentage of Total Loans 4.00%  
Loans and Leases Receivable, Gross, Total $ 28,358,000 38,076,000
Agriculture [Member] | Substandard [Member]    
Loans and Leases Receivable, Gross, Total