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Note 4 - Derivative Instruments and Hedging Activities (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2017
Dec. 31, 2022
USD ($)
Dec. 31, 2021
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax   $ (4,488) $ 18,728      
Derivative Assets (Liabilities), Net Fair Value of Derivative Contracts, Excluding Impact of Credit Risk   $ 45,003     $ 51,184  
Commodity Contract [Member]            
Derivative, Number of Instruments Held, Total           0
Interest Rate Swap [Member]            
Number of New Contracts Entered 3 7   20    
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax   $ (4,488) $ 18,728