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Note 4 - Derivative Instruments and Hedging Activities (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Mar. 31, 2020
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2017
Dec. 31, 2022
USD ($)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax     $ 1,045 $ 13,757 $ 2,309 $ 39,614    
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk $ 54,388   54,388   $ 54,388     $ 51,184
Commodity Contract [Member]                
Derivative, Number of Instruments Held, Total       0   0    
Interest Rate Swap [Member]                
Number of New Contracts Entered   3         20  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax $ 2,309   $ 1,045 $ 13,757   $ 39,614