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Note 6 - Discontinued Operations and Assets and Liabilities Held for Sale - Discontinued Operations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income (loss) from discontinued operations   $ (55,156) $ 4,542 $ 5,859
Disposal Group, Including Discontinued Operation, Contract Assets, Current $ 9,300 9,300 13,500  
Total current assets 92,850 92,850 168,799 162,236
Impairment of assets held for sale (1,300) (1,259) (23,427) 0
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current 200 200 200  
Total current liabilities 36,148 36,148 37,900  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]        
Receivables, net 26,901 [1] 26,901 [1] 43,256 [2]  
Retainage 203 [1] 203 [1] 518 [2]  
Disposal Group, Including Discontinued Operation, Contract Assets, Current 9,330 [1] 9,330 [1] 13,469 [2]  
Inventories 60 [1] 60 [1] 2,097 [2]  
Prepaid expenses and other current assets 2,652 [1] 2,652 [1] 3,379 [2]  
Total current assets 39,146 [1] 39,146 [1] 62,719 [2]  
Property, plant & equipment, less accumulated depreciation 7,962 [1] 7,962 [1] 17,167 [2]  
Goodwill 2,640 [1] 2,640 [1] 52,201 [2]  
Intangible assets, less accumulated amortization 33,718 [1] 33,718 [1] 38,481 [2]  
Operating lease assets 8,734 [1] 8,734 [1] 11,546 [2]  
Other non-current assets 650 [1] 650 [1] 663 [2]  
Impairment of assets held for sale   0 [1] (13,978) [2]  
Total assets held for sale 92,850 [1] 92,850 [1] 168,799 [2]  
Accounts payable 5,211 [1] 5,211 [1] 8,688 [2]  
Accrued expenses 20,927 [1] 20,927 [1] 16,707 [2]  
Operating lease liabilities 2,301 [1] 2,301 [1] 1,775 [2]  
Disposal Group, Including Discontinued Operation, Contract Liabilities, Current 165 [1] 165 [1] 167 [2]  
Total current liabilities 28,604 [1] 28,604 [1] 27,337 [2]  
Operating lease liabilities 7,348 7,348 10,368  
Other non-current liabilities 196 [1] 196 [1] 195 [2]  
Total liabilities held for sale $ 36,148 [1] 36,148 [1] 37,900 [2]  
Energy Services [Member] | Discontinued Operations, Held-for-sale [Member]        
Revenues   271,529 328,048 335,707
Cost of revenues   247,453 286,814 294,160
Gross profit   24,076 41,234 41,547
Operating expenses   28,455 30,652 31,675
Goodwill impairment   47,977 0 0
Definite-lived intangible asset impairment   957 0 0
Restructuring and related charges   804 842 234
Operating income (loss)   (54,117) 9,740 9,638
Interest expense(1) [3]   (3,308) (2,644) (2,618)
Total other expense   (3,308) (2,644) (2,618)
Income (loss) before taxes on income   (57,425) 7,096 7,020
Taxes (benefit) on income (loss)   (2,269) 2,554 1,161
Net income (loss) from discontinued operations   $ (55,156) $ 4,542 $ 5,859
[1] Includes Energy Services and Environmental Techniques.
[2] Includes Energy Services, Environmental Techniques, Insituform Australia, Insituform Spain and land held at Corporate.
[3] The Company allocated interest expense, including a portion of the settlement amount from the Company's interest rate swaps, to its discontinued operations based on carrying value at December 31, 2020.