Note 3 - Impairment Charges and Other Costs (Details Textual) - USD ($) $ in Thousands	3 Months Ended	15 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Goodwill, Impairment Loss	$ 0	$ 24,413
Equity Method Investment, Other than Temporary Impairment			$ 9,600
Nonoperating Income (Expense) [Member]
Litigation Settlement, Expense	66,000
Legal, Accounting and Investigation Fees	$ 7,300	5,200
Water and Mineral Services Group Materials [Member]
Goodwill, Impairment Loss		14,800
Water and Minerals Services Group Specialty [Member]
Goodwill, Impairment Loss		$ 0

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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