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Note 6 - Premises and Equipment (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Depreciation, Total   $ 739 $ 766 $ 805
Marion Branch Office [Member]        
Gain (Loss) on Disposition of Property Plant Equipment, Total $ 134