Note 4 - Goodwill and Intangible Assets (Details) (USD $)	12 Months Ended				3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014	Jun. 30, 2014	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	$ 100,000	[1],[2]
Amortization of Intangible Assets	14,100,000		12,200,000	10,500,000
Goodwill, Impairment Loss	51,512,000		0	0
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	13 years	[3],[4]
Non-competes [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	4 years
Fyfe Asia [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Purchase Accounting Adjustments						1,098,000
Impairment of Intangible Assets (Excluding Goodwill)					1,400,000
Brinderson LP [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Purchase Accounting Adjustments	1,000,000				(1,000,000)
Bayou [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)							10,900,000
Europe [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)					2,700,000
CRTS [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss					5,700,000
Infrastructure Solutions [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Acquired During Period	1,100,000	[1],[2]
Goodwill, Impairment Loss					29,700,000
Infrastructure Solutions [Member] | Fyfe Asia [Member]
Finite-Lived Intangible Assets [Line Items]
Goodwill, Impairment Loss	$ 16,069,000				$ (29,700,000)

[1] During the second quarter of 2014, the Company recorded goodwill of $1.1 million related to the 2012 acquisition of Fyfe Asia (see Note 1).

[2] During the fourth quarter of 2014, the Company decreased goodwill by $1.0 million related to the 2013 acquisition of Brinderson (see Note 1)

[3] During the third quarter of 2014, the Company recorded an intangible asset impairment of $10.9 million related to realignment efforts at Bayou (see Note 2).

[4] During the fourth quarter of 2014, the Company recorded an intangible asset impairment of $1.4 million related to Fyfe (see Note 2).