Note 3 - Discontinued Operations - Cash Flows for Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2022	Mar. 31, 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	10,059
Gain on sale of discontinued operations		6,234	(0)
Purchases of property and equipment		3,376	3,307
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.