Note 3 - Acquisitions (Detail) - Final Allocation of Purchase Price for the MES Acquisition (MES Group [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2011 Preliminary Purchase Price Allocation [Member] Customer Relationships [Member]	Dec. 31, 2011 Preliminary Purchase Price Allocation [Member] Trade Names [Member]	Dec. 31, 2011 Preliminary Purchase Price Allocation [Member] Noncompete Agreements [Member]	Dec. 31, 2011 Preliminary Purchase Price Allocation [Member] Technology [Member]	Dec. 31, 2011 Preliminary Purchase Price Allocation [Member] Goodwill [Member]	Dec. 31, 2011 Preliminary Purchase Price Allocation [Member]	Dec. 31, 2011 Purchase Price Adjustments and Reclassifications [Member] Goodwill [Member]	Dec. 31, 2011 Purchase Price Adjustments and Reclassifications [Member]	Sep. 30, 2012 Final Purchase Price Allocation [Member] Customer Relationships [Member]	Sep. 30, 2012 Final Purchase Price Allocation [Member] Trade Names [Member]	Sep. 30, 2012 Final Purchase Price Allocation [Member] Noncompete Agreements [Member]	Sep. 30, 2012 Final Purchase Price Allocation [Member] Technology [Member]	Sep. 30, 2012 Final Purchase Price Allocation [Member] Goodwill [Member]	Sep. 30, 2012 Final Purchase Price Allocation [Member]	Dec. 31, 2011
Building, equipment and leasehold improvements						$ 1,800								$ 1,800
Intangible assets	38,190	17,426	511	762	159,988		2,048		38,190	17,426	511	762	162,036
Net deferred tax liability associated with step-up in book basis						(18,244)		693						(17,551)
Assets acquired and liabilities assumed, net						14,581		(2,741)						11,840
Totals						$ 215,014								$ 215,014	$ 215,000