Note 1 - Description of Business (Detail) - Business Acquisitions - Initial Purchase Price Allocation (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Aug. 31, 2011	Dec. 31, 2011 CRTS [Member]	Jun. 30, 2011 CRTS [Member]	Dec. 31, 2010 CRTS [Member]	Dec. 31, 2011 Hockway [Member]	Aug. 31, 2011 Hockway [Member]	Dec. 31, 2010 Hockway [Member]	Dec. 31, 2011 Fyfe NA [Member]	Aug. 31, 2011 Fyfe NA [Member]	Dec. 31, 2010 Fyfe NA [Member]
Cash				$ 361			$ 536			$ 1,096
Receivables and cost and estimated earnings in excess of billings				2,365			1,993			16,019
Inventories				21			623			5,977
Prepaid expenses and other current assets				175			228			792
Property, plant and equipment				5,350			324			1,064
Identified intangible assets				26,220			2,200			53,768
Accounts payable, accrued expenses and billings in excess of cost and estimated earnings				(2,830)			(1,826)			(3,642)
Deferred tax liabilities				(11,395)
Total identifiable net assets			20,267	20,267	19,883	4,078	4,078	4,551	75,074	75,074	69,704
Goodwill at December 31, 2011			18,493	18,493	18,017	1,982	1,982	1,524	43,239	43,239	46,082
Total consideration recorded	$ 163,133	$ 115,800		$ 38,760			$ 6,060			$ 118,313