Note 4 - Goodwill and Intangible Assets (Detail) - Intangible Assets (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Gross Carrying Amount	$ 191,188		$ 189,645
Accumulated Amortization	(42,427)		(39,990)
Net Carrying Amount	148,761		149,655
Licensing Agreements [Member]
Weighted Average Useful Lives (Years)	8 years
Gross Carrying Amount	3,924		3,922
Accumulated Amortization	(2,698)		(2,654)
Net Carrying Amount	1,226		1,268
Order or Production Backlog [Member]
Weighted Average Useful Lives (Years)	0 years
Gross Carrying Amount	4,655		4,651
Accumulated Amortization	(4,157)		(3,705)
Net Carrying Amount	498		946
Lease Agreements [Member]
Weighted Average Useful Lives (Years)	16 years
Gross Carrying Amount	2,067		2,067
Accumulated Amortization	(120)		(183)
Net Carrying Amount	1,947		1,884
Trademarks [Member]
Weighted Average Useful Lives (Years)	13 years
Gross Carrying Amount	21,418		21,396
Accumulated Amortization	(2,392)		(2,141)
Net Carrying Amount	19,026		19,255
Noncompete Agreements [Member]
Weighted Average Useful Lives (Years)	0 years
Gross Carrying Amount	740		740
Accumulated Amortization	(740)		(729)
Net Carrying Amount			11
Customer Relationships [Member]
Weighted Average Useful Lives (Years)	16 years
Gross Carrying Amount	104,495	[1]	102,963
Accumulated Amortization	(12,541)		(10,970)
Net Carrying Amount	91,954		91,993
Patents [Member]
Weighted Average Useful Lives (Years)	18 years
Gross Carrying Amount	53,889		53,906
Accumulated Amortization	(19,779)		(19,608)
Net Carrying Amount	$ 34,110		$ 34,298

[1] During the quarter ended March 31, 2012, the Company recorded $1.4 million in customer relationships to be amortized over a weighted average life of twenty years related to the acquisitions discussed in Note 1.