Note 2 - Discontinued Operations and Held-for-sale - Discontinued Operations (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Net income (loss) from discontinued operations		$ (20,027)	$ 4,020	$ 29,602	$ (2,922)	$ 3,174	$ (131,022)	$ (4,618)	$ (31,933)	$ 10,673	$ (164,399)		$ (28,766)
WMS Inliner [Member]
Revenue										491,812	433,580		530,729
Cost of revenue										434,723	393,445		498,836
Selling, general and administrative expenses										59,932	63,405		69,834
Non-cash impairment charges (1)										0	156,690	[1],[2]	0
Other costs										6,196	125		8,564
Gain on sales of property and equipment, net (2)	[3]									(32,658)	(2,005)		(5,330)
Other (income) expense, net										(8,004)	(3,472)		(4,321)
Provision for (benefit from) income taxes										20,950	(10,209)		(8,088)
Net income (loss) from discontinued operations										$ 10,673	$ (164,399)		$ (28,766)

[1] During 2020 the interim goodwill impairment tests resulted in impairment charges. See further discussion in note (1) in the statements of operations table within this footnote.

[2] During 2020, we performed two interim goodwill impairment tests. The first was on the WMS Materials and WMS Specialty reporting units due to an adverse change in the business climate for these reporting units, including a modified relationship with a business partner, increased competition and market consolidation, exacerbated by economic disruption and market conditions associated with the COVID-19 pandemic. The goodwill impairment test resulted in a $14.8 million impairment charge during the three months ended March 31, 2020 associated with the WMS Materials reporting unit and no impairment charge related to the WMS Specialty reporting unit. The second test was on the WMS Water and WMS Materials reporting units due to the continued impact from an adverse change in the business climate, including reduced market share due to loss of strategic personnel during the three months ended September 30, 2020. The goodwill impairment test resulted in an additional impairment charge of $117.9 million and $14.4 million associated with our WMS Water and WMS Materials reporting units, respectively, during the three months ended September 30, 2020. In addition, we recorded an impairment charge of $9.6 million during the year ended December 31, 2020 related to entities within investments in foreign affiliates related due to other than temporary adverse changes in the associated business climate.

[3] During 2021, we completed a sale-leaseback transaction for two properties in California. The sale of these properties resulted in a reduction in net property and equipment of $11.1 million and a $2.4 million addition to both right of use assets and lease liabilities on the held-for-sale balance sheets, as well as a $29.7 million gain on sales of property and equipment on the discontinued operations statements of operations.