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Note 17 - Operating Lease Commitments and Contingencies (Details Textual) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Operating Lease, Weighted Average Discount Rate, Percent 3.23%  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 745,000 $ 0
Occupancy Expense [Member]    
Operating Lease, Expense 214,000  
Furniture and Fixtures Expense [Member]    
Operating Lease, Expense 37,000  
Other Assets [Member]    
Operating Lease, Right-of-Use Asset 1,637,000  
Accrued Interest and Other Liabilities [Member]    
Operating Lease, Liability, Total $ 1,637,000  
Minimum [Member]    
Lessee, Operating Lease, Renewal Term 1 year  
Lessee, Operating Lease, Discount Rate 2.77%  
Maximum [Member]    
Lessee, Operating Lease, Renewal Term 8 years  
Lessee, Operating Lease, Discount Rate 3.50%