Note 12 - Segment and Geographic Information (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $) In Thousands, unless otherwise specified	3 Months Ended													12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues:
Revenues	$ 315,679	[1]	$ 307,665	[1]	$ 242,100	$ 225,976	$ 271,595	[2]	$ 262,867	[2]	$ 254,490	[2]	$ 227,879	$ 1,091,420		$ 1,016,831		$ 925,766
Operating income (loss):
Operating income (loss)	22,209	[1]	22,032	[1]	15,823	6,818	25,097	[2]	26,865	[2]	18,654	[2]	11,187	66,882		81,803		45,707
Long-lived assets: (1)
Long-lived assets	205,719	[3]					210,497	[3]						205,719	[3]	210,497	[3]	192,316	[3]
United States [Member]
Revenues:
Revenues														672,192		589,027		539,378
Operating income (loss):
Operating income (loss)														24,977		40,676		(1,042)
Long-lived assets: (1)
Long-lived assets	154,367	[3]					151,337	[3]						154,367	[3]	151,337	[3]	144,151	[3]
Canada [Member]
Revenues:
Revenues														179,236		180,283		178,739
Operating income (loss):
Operating income (loss)														28,955		31,376		31,892
Long-lived assets: (1)
Long-lived assets	28,539	[3]					28,724	[3]						28,539	[3]	28,724	[3]	22,998	[3]
Europe [Member]
Revenues:
Revenues														90,646		86,883		102,471
Operating income (loss):
Operating income (loss)														6,276		6,196		9,391
Long-lived assets: (1)
Long-lived assets	10,007	[3]					16,396	[3]						10,007	[3]	16,396	[3]	12,474	[3]
Other foreign [Member]
Revenues:
Revenues														149,346		160,638		105,178
Operating income (loss):
Operating income (loss)														6,674		3,555		5,466
Long-lived assets: (1)
Long-lived assets	$ 12,806	[3]					$ 14,040	[3]						$ 12,806	[3]	$ 14,040	[3]	$ 12,693	[3]

[1] (1) Includes the financial results of Brinderson, which was acquired in July 2013.

[2] (2) Includes the financial results of Fyfe Asia, which was acquired in April 2012.

[3] Long-lived assets as of December 31, 2013, 2012 and 2011 do not include intangible assets, goodwill or deferred tax assets.