Note 3 - Discontinued Operations - Cash Flows for Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Gain on sale of discontinued operations				$ 6,234	$ (0)
Proceeds From the Sale of Discontinued Operations				142,571	0
WMS Inliner [Member]
Depreciation, depletion and amortization	[1]			0	20,239
Gain on sale of discontinued operations		$ (0)	$ (0)	6,234	(0)
Gain on sale of property and equipment				8,796	30,893
Purchases of property and equipment				5,597	7,775
Proceeds from sales of property and equipment				12,697	44,287
Proceeds From the Sale of Discontinued Operations				$ 142,571	$ 0

[1] In accordance with ASC Topic 360, Property, Plant, and Equipment, we ceased recording depreciation and amortization for WMS property, plant and equipment, finite-lived tangible assets and right-of-use lease assets as of December 31, 2021.