Note 3 - Revenues (Tables)

9 Months Ended

Sep. 30, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Quarter Ended September 30, 2020								Quarter Ended September 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Geographic region:
United States	$	119,334	$	30,277	$	62,796	$	212,407	$	112,357	$	42,746	$	76,801	$	231,904
Canada		20,864		13,461		—		34,325		17,775		14,349		—		32,124
Europe		5,727		4,230		—		9,957		12,889		3,458		—		16,347
Other foreign		6,177		13,018		—		19,195		13,066		15,348		—		28,414
Total revenues	$	152,102	$	60,986	$	62,796	$	275,884	$	156,087	$	75,901	$	76,801	$	308,789

	Nine Months Ended September 30, 2020								Nine Months Ended September 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Geographic region:
United States	$	337,457	$	99,624	$	205,993	$	643,074	$	321,205	$	116,093	$	243,368	$	680,666
Canada		46,092		35,083		—		81,175		47,320		42,264		—		89,584
Europe		17,500		10,320		—		27,820		38,302		11,429		—		49,731
Other foreign		18,689		37,518		—		56,207		36,242		48,210		—		84,452
Total revenues	$	419,738	$	182,545	$	205,993	$	808,276	$	443,069	$	217,996	$	243,368	$	904,433

	Quarter Ended September 30, 2020								Quarter Ended September 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	130,685	$	43,812	$	1,003	$	175,500	$	139,363	$	53,704	$	1,003	$	194,070
Time and materials		—		8,696		61,793		70,489		—		16,092		75,798		91,890
Product sales		21,369		8,478		—		29,847		16,675		6,105		—		22,780
License fees		48		—		—		48		49		—		—		49
Total revenues	$	152,102	$	60,986	$	62,796	$	275,884	$	156,087	$	75,901	$	76,801	$	308,789

	Nine Months Ended September 30, 2020								Nine Months Ended September 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	364,591	$	126,449	$	3,946	$	494,986	$	394,489	$	149,333	$	3,213	$	547,035
Time and materials		—		31,501		202,047		233,548		—		48,351		240,155		288,506
Product sales		55,099		24,595		—		79,694		48,337		20,312		—		68,649
License fees		48		—		—		48		243		—		—		243
Total revenues	$	419,738	$	182,545	$	205,993	$	808,276	$	443,069	$	217,996	$	243,368	$	904,433

Contract Asset and Liability [Table Text Block]

	September 30, 2020 (1)			December 31, 2019 (2)
Contract assets – current	$	51,150		$	51,092
Contract liabilities – current		(37,034	)		(37,562	)
Net contract assets	$	14,116		$	13,530