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Note 2 - Discontinued Operations and Held-for-sale - Cash Flows for Discontinued Operations (Details) - WMS Inliner [Member] - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Depreciation, depletion and amortization $ 39,556 $ 48,010 $ 55,865
Non-cash impairment charges (1) 0 156,690 [1],[2] 0
Purchases of property and equipment (11,982) (16,657) (13,451)
Proceeds from sales of property and equipment $ 49,266 $ 7,610 $ 11,522
[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.