Note 9 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Finance Lease, Right-of-Use Asset, before Accumulated Amortization	$ 82,467		$ 82,467		$ 80,232
Finance Lease, Right-of-Use Asset, Accumulated Amortization	47,882		47,882		$ 34,036
Finance Lease, Right-of-Use Asset, Amortization	$ 5,960	$ 6,409	$ 18,058	$ 21,456