Note 3 - Acquisitions (Detail) - Final Allocation of Purchase Price for the Premex Acquisition (Premex 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
Equipment and leasehold improvements						$ 650								$ 650
Intangible Assets	32,886	10,602	109	2,356	28,131		3,686		32,886	10,602	109	2,356	31,817
Net deferred tax asset (liability) associated with step-up in book basis						603		(3,695)						(3,092)
Assets acquired and liabilities assumed, net						33,019		9						33,028
Totals						$ 108,356								$ 108,356	$ 108,400