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Note 8 - Derivatives (Details Textual) - Interest Rate Swap [Member] - Not Designated as Hedging Instrument [Member]
$ in Millions
1 Months Ended
May 30, 2019
Nov. 30, 2018
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Derivative, Number of Instruments Held, Total     4  
Derivative, Number of Instruments Added During the Period 2 2    
Derivative, Collateral, Right to Reclaim Cash     $ 1.4 $ 1.4