Note 14 - Fair Value of Financial instruments - Financial Instruments Measured at Fair Value (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Inputs, Level 1 [Member] | Commodity Contract [Member]
Liabilities, net	$ 0	$ 0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Liabilities, net	0	0
Fair Value, Inputs, Level 2 [Member] | Commodity Contract [Member]
Liabilities, net	(174,928)	(52,204)
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Liabilities, net	303	(517)
Fair Value, Inputs, Level 3 [Member] | Commodity Contract [Member]
Liabilities, net	0	0
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Liabilities, net	$ 0	$ 0