Note 14 - Business Segment Information (Details) - Summary of Net Revenue by Geographical Area (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net revenue
Net Revenue	$ 22,664	$ 18,855	$ 66,712	$ 70,865
UNITED STATES
Net revenue
Net Revenue	14,429	11,542	44,627	47,761
CHINA
Net revenue
Net Revenue	3,616	4,374	9,627	10,821
Latin America [Member]
Net revenue
Net Revenue	1,120	1,055	4,254	7,505
CANADA
Net revenue
Net Revenue	1,415	530	4,305	2,036
MEXICO
Net revenue
Net Revenue	793	527	2,075	962
Europe [Member]
Net revenue
Net Revenue	556	654	898	976
Asia Excluding China [Member]
Net revenue
Net Revenue	677	120	833	486
Other Countries [Member]
Net revenue
Net Revenue	$ 58	$ 53	$ 93	$ 318