Note 9 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	$ 80,273		$ 80,273		$ 80,232
Finance Lease, Right-of-Use Asset, Accumulated Amortization	41,923		41,923		$ 34,036
Finance Lease, Right-of-Use Asset, Amortization	$ 5,868	$ 6,428	$ 12,098	$ 15,047