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Note 3 - Loans and Allowance for Loan Losses - Allowance Related to Troubled Debt Restructurings (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Related allowance $ 755,000 $ 467,000
Commercial Portfolio Segment [Member]    
Related allowance 477,000 120,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]    
Related allowance 355,000 53,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]    
Related allowance 0 0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]    
Related allowance 117,000 59,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]    
Related allowance 5,000 8,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]    
Related allowance 0 0
Retail Portfolio Segment [Member]    
Related allowance 278,000 347,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member]    
Related allowance 175,000 202,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]    
Related allowance $ 103,000 $ 145,000