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Note 8 - Derivatives (Details Textual)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 30, 2021
USD ($)
May 30, 2019
Nov. 30, 2018
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax       $ 85,000 $ (0) $ 85,000 $ (0)  
Interest Rate Swap [Member]                
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax       $ 85,000   $ 85,000    
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]                
Derivative, Number of Instruments Held, Total       4   4    
Derivative, Number of Instruments Added During the Period   2 2          
Derivative, Collateral, Right to Reclaim Cash       $ 1,400,000   $ 1,400,000   $ 1,400,000
Gain (Loss) on Derivative Instruments, Net, Pretax, Total       0 $ 0 0 $ 0  
Derivative Asset, Fair Value of Collateral       $ 1,400,000   $ 1,400,000    
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]                
Derivative, Notional Amount $ 50,000,000              
Derivative, Term of Contract (Year) 7 years         6 years 9 months 18 days    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax           $ 168,000    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred           $ 508,000