Note 9 - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
MEXICO
Revenue, Net	$ 5,106	$ 3,933	$ 10,105	$ 8,114
% of consolidated net revenue	17.20%	13.30%	17.90%	13.80%
SOUTH AFRICA
Revenue, Net	$ 4,721	$ 5,330	$ 8,935	$ 10,221
% of consolidated net revenue	15.90%	18.10%	15.90%	17.40%
CHINA
Revenue, Net	$ 2,882	$ 3,487	$ 5,617	$ 6,515
% of consolidated net revenue	9.70%	11.80%	10.00%	11.10%
CANADA
Revenue, Net	$ 1,871	$ 1,249	$ 3,129	$ 2,805
% of consolidated net revenue	6.30%	4.20%	5.60%	4.80%
JAPAN
Revenue, Net	$ 1,765	$ 1,400	$ 3,358	$ 2,601
% of consolidated net revenue	5.90%	4.80%	6.00%	4.40%
INDIA
Revenue, Net	$ 1,376	$ 1,705	$ 2,680	$ 3,616
% of consolidated net revenue	4.60%	5.80%	4.80%	6.20%
AUSTRALIA
Revenue, Net	$ 755	$ 1,142	$ 1,414	$ 2,487
% of consolidated net revenue	2.50%	3.90%	2.50%	4.20%
TURKEY
Revenue, Net	$ 72	$ 116	$ 169	$ 297
% of consolidated net revenue	0.20%	0.40%	0.30%	0.50%
International [Member]
Revenue, Net	$ 18,548	$ 18,362	$ 35,407	$ 36,656
% of consolidated net revenue	62.30%	62.30%	63.00%	62.40%
Revenue, Net	$ 29,732	$ 29,467	$ 56,343	$ 58,733