Note 10 - Segment Information (Details) - Geographic Data (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	$ 29,266,000	$ 28,036,000
Geographic Concentration Risk [Member] | SOUTH AFRICA | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	16.70%	13.80%
Geographic Concentration Risk [Member] | MEXICO | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	14.30%	15.50%
Geographic Concentration Risk [Member] | CHINA | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	10.30%	6.80%
Geographic Concentration Risk [Member] | INDIA | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	6.50%	5.80%
Geographic Concentration Risk [Member] | CANADA | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	5.30%	4.40%
Geographic Concentration Risk [Member] | AUSTRALIA | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	4.60%	5.20%
Geographic Concentration Risk [Member] | JAPAN | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	4.10%	7.50%
Geographic Concentration Risk [Member] | TURKEY | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	0.60%	2.00%
Geographic Concentration Risk [Member] | International [Member] | Sales Revenue, Net [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
% of consolidated net revenue	62.40%	61.00%
SOUTH AFRICA
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	4,891,000	3,871,000
MEXICO
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	4,181,000	4,339,000
CHINA
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	3,028,000	1,916,000
INDIA
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	1,911,000	1,618,000
CANADA
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	1,556,000	1,238,000
AUSTRALIA
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	1,345,000	1,454,000
JAPAN
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	1,201,000	2,095,000
TURKEY
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	181,000	547,000
International [Member]
Note 10 - Segment Information (Details) - Geographic Data [Line Items]
Revenues	$ 18,294,000	$ 17,078,000