Note 6 - Revenue - Revenue by Areas of Capability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total revenue	$ 825,762	$ 675,026	$ 810,064
Well Construction [Member]
Total revenue	112,126	0	0
Well Management [Member]
Total revenue	$ 713,636	$ 675,026	$ 810,064