Note 9 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues:
Revenues	$ 350,138	$ 307,665	$ 979,240	$ 775,741
Gross Profit:
Gross profit	63,939	69,411	196,920	176,116
Operating income (loss)
Operating income (loss)	(13,934)	22,032	15,819	44,673
United States [Member]
Revenues:
Revenues	242,795	202,353	681,043	496,544
Gross Profit:
Gross profit	40,507	43,838	132,790	111,006
Operating income (loss)
Operating income (loss)	(12,955)	8,941	604	16,067
Canada [Member]
Revenues:
Revenues	55,742	56,026	139,817	131,172
Gross Profit:
Gross profit	13,893	14,351	32,889	31,753
Operating income (loss)
Operating income (loss)	10,359	10,397	21,911	20,622
Europe [Member]
Revenues:
Revenues	20,096	20,605	63,887	65,592
Gross Profit:
Gross profit	3,544	4,769	12,846	15,453
Operating income (loss)
Operating income (loss)	(687)	1,106	692	3,928
Other foreign [Member]
Revenues:
Revenues	31,505	28,681	94,493	82,433
Gross Profit:
Gross profit	5,995	6,453	18,395	17,904
Operating income (loss)
Operating income (loss)	$ (10,651)	$ 1,588	$ (7,388)	$ 4,056