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Note 7 - Goodwill and Other Intangibles (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2019
Mar. 31, 2016
Mar. 31, 2016
Dec. 31, 2019
Dec. 31, 2018
Goodwill, Ending Balance       $ 11,671 $ 665
Goodwill, Impairment Loss       $ 0 0
Bank of America Branches [Member]          
Goodwill, Ending Balance   $ 665 $ 665    
Core Deposits [Member]          
Finite-lived Intangible Assets Acquired $ 4,400        
Goodwill, Ending Balance $ 11,000        
Finite-Lived Intangible Asset, Useful Life 8 years   8 years    
Acquired Finite-lived Intangible Asset, Residual Value   0 $ 0   $ 32
Finite-Lived Intangible Asset, Amortization Period     15 years   15 years
Core Deposits [Member] | Bank of America Branches [Member]          
Finite-lived Intangible Assets Acquired   $ 1,800