Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues:
Revenues	$ 306,234	$ 225,976
Gross Profit:
Gross profit	61,063	48,137
Operating income (loss)
Operating income (loss)	9,134	6,818
United States [Member]
Revenues:
Revenues	210,630	138,747
Gross Profit:
Gross profit	41,393	29,112
Operating income (loss)
Operating income (loss)	2,396	(106)
Canada [Member]
Revenues:
Revenues	41,864	39,394
Gross Profit:
Gross profit	9,062	9,303
Operating income (loss)
Operating income (loss)	5,423	5,748
Europe [Member]
Revenues:
Revenues	22,616	22,651
Gross Profit:
Gross profit	4,758	5,003
Operating income (loss)
Operating income (loss)	527	868
Other foreign [Member]
Revenues:
Revenues	31,124	25,184
Gross Profit:
Gross profit	5,850	4,719
Operating income (loss)
Operating income (loss)	$ 788	$ 308