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Note 4 - Derivative Instruments and Hedging Activities (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2017
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax   $ 5,752 $ 7,129 $ 1,264 $ 25,857      
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk   52,998   52,998     $ 51,184  
Commodity Contract [Member]                
Derivative, Number of Instruments Held, Total               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   $ 5,752 $ 7,129 $ 1,264 $ 25,857