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Note 11 - Borrowings - (Details Textual)
Dec. 17, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 12, 2016
USD ($)
Advances from Federal Home Loan Banks, Net of Unaccreted Market Value Adjustment   $ 55,000,000 $ 75,000,000  
Advances from Federal Home Loan Banks, Total   55,000,000 75,000,000  
Pledged Financial Instruments, Not Separately Reported, Loans Receivable, for Federal Home Loan Bank Debt   544,000,000    
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds   351,600,000    
Long-term Debt, Total   2,700,000  
Short-term Debt, Total   862,000  
Subordinated Debt, Ending Balance $ 25,000,000 25,000,000  
Subordinated Borrowing, Interest Rate 6.75%      
FNBB Advance [Member]        
Debt Instrument, Face Amount       $ 3,000,000
Debt Instrument, Number of Payments       9
Debt Instrument, Annual Principal Payment       $ 300,000
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid       303,000
Long-term Debt, Total     $ 2,700,000  
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate     4.50%  
Federal Funds Purchased [Member]        
Line of Credit Facility, Current Borrowing Capacity   126,000,000 $ 113,500,000  
Long-term Line of Credit, Total   0 0  
FNBB Line of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity       $ 5,000,000
Short-term Debt, Total     $ 862,000  
Short-term Debt, Percentage Bearing Variable Interest Rate     4.50%  
November 2022 [Member]        
Advances from Federal Home Loan Banks, Total   $ 30,000,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate   2.41%    
June 2019 [Member]        
Advances from Federal Home Loan Banks, Total   $ 25,000,000    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate   2.54%    
December 2018 [Member]        
Advances from Federal Home Loan Banks, Total     $ 15,000,000  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate     1.90%  
March 2018 [Member]        
Advances from Federal Home Loan Banks, Total     $ 30,000,000  
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Interest Rate     1.53%