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Note 12 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net revenues	$ 252,876	$ 229,191
BRAZIL
Net revenues	$ 65,942	$ 54,060
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	26.10%	23.60%
SOUTH AFRICA
Net revenues	$ 27,201	$ 28,566
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	10.80%	12.50%
MEXICO
Net revenues	$ 23,324	$ 21,233
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	9.20%	9.30%
CHINA
Net revenues	$ 12,993	$ 13,181
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	5.10%	5.80%
INDIA
Net revenues	$ 11,469	$ 10,814
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	4.50%	4.70%
CANADA
Net revenues	$ 9,059	$ 8,392
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.60%	3.70%
JAPAN
Net revenues	$ 8,813	$ 9,269
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.50%	4.00%
AUSTRALIA
Net revenues	$ 3,087	$ 3,405
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	1.20%	1.50%
TURKEY
Net revenues	$ 268	$ 222
TURKEY | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	0.10%	0.10%
International [Member]
Net revenues	$ 162,156	$ 149,142
International [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	64.10%	65.20%

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