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Note 4 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Number of loans 3 1
Pre-modification outstanding recorded balance $ 540,550 $ 119,459
Post-modification outstanding recorded balance 444,645 119,459
Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Term [Member]    
Post-modification outstanding recorded balance 30,130 119,459
Combination [Member]    
Post-modification outstanding recorded balance $ 414,515 $ 0
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member]    
Number of loans 0 0
Pre-modification outstanding recorded balance $ 0 $ 0
Post-modification outstanding recorded balance 0 0
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member] | Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member] | Term [Member]    
Post-modification outstanding recorded balance 0 0
Residential Portfolio Segment [Member] | Real Estate Residential, One To Four Family Units [Member] | Combination [Member]    
Post-modification outstanding recorded balance $ 0 $ 0
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member]    
Number of loans 0 0
Pre-modification outstanding recorded balance $ 0 $ 0
Post-modification outstanding recorded balance 0 0
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member] | Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member] | Term [Member]    
Post-modification outstanding recorded balance 0 0
Residential Portfolio Segment [Member] | Real Estate Residential, Multi Family Units [Member] | Combination [Member]    
Post-modification outstanding recorded balance $ 0 $ 0
Real Estate, Construction [Member]    
Number of loans 0 0
Pre-modification outstanding recorded balance $ 0 $ 0
Post-modification outstanding recorded balance 0 0
Real Estate, Construction [Member] | Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Real Estate, Construction [Member] | Term [Member]    
Post-modification outstanding recorded balance 0 0
Real Estate, Construction [Member] | Combination [Member]    
Post-modification outstanding recorded balance $ 0 $ 0
Commercial Real Estate Portfolio Segment [Member]    
Number of loans 0 0
Pre-modification outstanding recorded balance $ 0 $ 0
Post-modification outstanding recorded balance 0 0
Commercial Real Estate Portfolio Segment [Member] | Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Commercial Real Estate Portfolio Segment [Member] | Term [Member]    
Post-modification outstanding recorded balance 0 0
Commercial Real Estate Portfolio Segment [Member] | Combination [Member]    
Post-modification outstanding recorded balance $ 0 $ 0
Commercial Portfolio Segment [Member]    
Number of loans 3 0
Pre-modification outstanding recorded balance $ 540,550 $ 0
Post-modification outstanding recorded balance 444,645 0
Commercial Portfolio Segment [Member] | Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Commercial Portfolio Segment [Member] | Term [Member]    
Post-modification outstanding recorded balance 30,130 0
Commercial Portfolio Segment [Member] | Combination [Member]    
Post-modification outstanding recorded balance $ 414,515 $ 0
Consumer and Other Loans [Member]    
Number of loans 0 1
Pre-modification outstanding recorded balance $ 119,459
Post-modification outstanding recorded balance 119,459
Consumer and Other Loans [Member] | Interest Rate [Member]    
Post-modification outstanding recorded balance 0 0
Consumer and Other Loans [Member] | Term [Member]    
Post-modification outstanding recorded balance 0 119,459
Consumer and Other Loans [Member] | Combination [Member]    
Post-modification outstanding recorded balance $ 0 $ 0