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		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region [Line Items]
Revenues	$ 242,100	$ 254,490	$ 468,076	$ 482,368
Gross profit	58,568	62,219	106,705	114,790
Operating income (loss)	15,823	18,654	22,641	29,841
Canada [Member]
Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region [Line Items]
Revenues	35,752	39,369	75,146	83,758
Gross profit	8,100	9,344	17,402	20,643
Operating income (loss)	4,477	5,223	10,225	11,859
Europe [Member]
Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region [Line Items]
Revenues	22,337	21,001	44,987	40,943
Gross profit	5,680	5,332	10,684	9,775
Operating income (loss)	1,955	1,745	2,823	2,097
Other foreign [Member]
Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region [Line Items]
Revenues	28,567	21,624	53,752	43,563
Gross profit	6,733	709	11,451	1,684
Operating income (loss)	2,160	(1,624)	2,467	(3,354)
United States [Member]
Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region [Line Items]
Gross profit	38,055	46,834	67,168	82,688
Operating income (loss)	7,231	13,310	7,126	19,239
United States [Member]
Note 8 - Segment Reporting (Details) - Summary of Revenues, Gross Profit and Operating Income (Loss) by Geographic Region [Line Items]
Revenues	$ 155,444	$ 172,496	$ 294,191	$ 314,104