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Note 14 - Commitments and Off-balance Sheet Risk (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Note 14 - Commitments and Off-balance Sheet Risk (Details) [Line Items]      
Reserve or Liability Balance for Financial Instruments With Off-balance Sheet Risk   $ 0  
Reserve or Liability Balance for Financial Instruments with Off-balance Sheet Risk     $ 0
Mortgage Loans on Real Estate, Minimum Interest Rate in Range   4.00%  
Mortgage Loans on Real Estate, Maximum Interest Rate in Range   7.00%  
Term Deb tSecured by Real Estate Balloon Payment Period   5 years  
Liabilities for Accreted Fee Collected from Customer   $ 100,000 100,000
Amount of Federal Reserve Requirement   9,100,000 $ 8,400,000
Interest Rate Swap [Member]      
Note 14 - Commitments and Off-balance Sheet Risk (Details) [Line Items]      
Derivative, Notional Amount   14,700,000  
Derivative, Fair Value, Net   $ (2,300,000)  
Minimum [Member]      
Note 14 - Commitments and Off-balance Sheet Risk (Details) [Line Items]      
Amortization Period for Term Debt Secured by Real Estate   10 years  
Interest Rates On Loans Secured by Non-real Estate Collateral   4.00%  
Term Debt Secured by Non-real Estate Collateral, Maturity Period   3 years  
Fees Accreted Into Income During Interest Rate Swap Agreements, Term 4 years    
Maximum [Member]      
Note 14 - Commitments and Off-balance Sheet Risk (Details) [Line Items]      
Amortization Period for Term Debt Secured by Real Estate   20 years  
Interest Rates On Loans Secured by Non-real Estate Collateral   7.50%  
Term Debt Secured by Non-real Estate Collateral, Maturity Period   7 years  
Fees Accreted Into Income During Interest Rate Swap Agreements, Term 15 years