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Note 8 - Premises, Equipment, and Leases (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Impairment of Long-Lived Assets to be Disposed of $ 380 $ 1,010 $ 677
Depreciation, Depletion and Amortization, Total $ 3,450 2,910 3,560
Operating Lease, Weighted Average Discount Rate, Percent 3.22%    
Operating Lease, Expense $ 203 $ 318 $ 582
Other Assets [Member]      
Operating Lease, Right-of-Use Asset 917,000    
Other Liabilities [Member]      
Operating Lease, Liability, Total $ 1,009    
Minimum [Member]      
Lessee Operating Lease Remaining Lease Term 2 years    
Maximum [Member]      
Lessee Operating Lease Remaining Lease Term 10 years    
Lease Acquired from Acquisition [Member]      
Operating Lease, Liability, Total $ 82