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Note 7 - Intangibles (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Mar. 11, 2016
Core Deposits [Member] | Bank of America Branches [Member]      
Finite-lived Intangible Assets Acquired $ 1,800,000    
Core Deposits [Member]      
Acquired Finite-lived Intangible Asset, Residual Value   $ 0  
Finite-Lived Intangible Asset, Useful Life   8 years  
Finite Lived Intangible Assets Amortizable Tax Basis   $ 1,800,000  
Bank of America Branches [Member]      
Goodwill $ 665,000   $ 665,000