Note 4 - Goodwill and Intangible Assets (Detail) (USD $)	3 Months Ended			12 Months Ended
	Mar. 31, 2012		Mar. 31, 2011	Dec. 31, 2011
Goodwill, Acquired During Period	$ 100,000	[1]		$ 63,700,000	[2]
Amortization of Intangible Assets	2,700,000		1,200,000
Fyfe LA [Member]
Goodwill, Acquired During Period	1,700,000
Finite-lived Intangible Assets Acquired	1,400,000
Finite-Lived Intangible Asset, Useful Life	20 years
Hockway [Member]
Goodwill, Acquired During Period				2,000,000
Goodwill, Purchase Accounting Adjustments	1,461,000
Fyfe NA [Member]
Goodwill, Acquired During Period				43,200,000
Goodwill, Purchase Accounting Adjustments	195,000
CRTS [Member]
Goodwill, Acquired During Period				$ 18,500,000

[1] During the first quarter of 2012, the Company recorded goodwill of $1.7 million related to the acquisition of Fyfe LA and decreases of $1.5 million and $0.2 million in goodwill related to the 2011 acquisitions of Hockway and Fyfe NA.

[2] During the year ended December 31, 2011, the Company recorded goodwill of $18.5 million related to the acquisition of CRTS, $2.0 million related to the acquisition of Hockway and $43.2 million related to the acquisition of Fyfe NA as discussed in Note 1.