Note 3 - Revenues (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Quarter Ended June 30, 2020								Quarter Ended June 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Geographic region:
United States	$	114,705	$	30,608	$	52,134	$	197,447	$	110,957	$	43,326	$	85,704	$	239,987
Canada		14,205		10,790		—		24,995		18,934		14,458		—		33,392
Europe		4,131		3,061		—		7,192		12,888		4,493		—		17,381
Other foreign		4,351		11,032		—		15,383		12,661		15,319		—		27,980
Total revenues	$	137,392	$	55,491	$	52,134	$	245,017	$	155,440	$	77,596	$	85,704	$	318,740

	Six Months Ended June 30, 2020								Six Months Ended June 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Geographic region:
United States	$	218,123	$	69,347	$	143,197	$	430,667	$	208,848	$	73,347	$	166,567	$	448,762
Canada		25,228		21,622		—		46,850		29,545		27,915		—		57,460
Europe		11,773		6,090		—		17,863		25,413		7,971		—		33,384
Other foreign		12,512		24,500		—		37,012		23,177		32,861		—		56,038
Total revenues	$	267,636	$	121,559	$	143,197	$	532,392	$	286,983	$	142,094	$	166,567	$	595,644

	Quarter Ended June 30, 2020								Quarter Ended June 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	121,395	$	38,382	$	1,213	$	160,990	$	136,212	$	53,055	$	1,291	$	190,558
Time and materials		—		9,835		50,921		60,756		—		17,283		84,413		101,696
Product sales		15,997		7,274		—		23,271		19,184		7,258		—		26,442
License fees		—		—		—		—		44		—		—		44
Total revenues	$	137,392	$	55,491	$	52,134	$	245,017	$	155,440	$	77,596	$	85,704	$	318,740

	Six Months Ended June 30, 2020								Six Months Ended June 30, 2019
	Infrastructure Solutions		Corrosion Protection		Energy Services		Total		Infrastructure Solutions		Corrosion Protection		Energy Services		Total
Contract type:
Fixed fee	$	233,906	$	82,637	$	2,943	$	319,486	$	255,127	$	95,628	$	2,210	$	352,965
Time and materials		—		22,805		140,254		163,059		—		32,259		164,357		196,616
Product sales		33,730		16,117		—		49,847		31,662		14,207		—		45,869
License fees		—		—		—		—		194		—		—		194
Total revenues	$	267,636	$	121,559	$	143,197	$	532,392	$	286,983	$	142,094	$	166,567	$	595,644

Contract Asset and Liability [Table Text Block]

	June 30, 2020 (1)			December 31, 2019 (2)
Contract assets – current	$	43,278		$	51,092
Contract liabilities – current		(37,512	)		(37,562	)
Net contract assets	$	5,766		$	13,530