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Note 12 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net revenues	$ 230,517	$ 252,876
BRAZIL
Net revenues	$ 49,940	$ 65,942
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	21.70%	26.10%
SOUTH AFRICA
Net revenues	$ 28,235	$ 27,201
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	12.20%	10.80%
MEXICO
Net revenues	$ 22,679	$ 23,324
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	9.80%	9.20%
CHINA
Net revenues	$ 12,401	$ 12,993
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	5.40%	5.10%
JAPAN
Net revenues	$ 9,273	$ 11,469
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	4.00%	4.50%
INDIA
Net revenues	$ 8,589	$ 8,813
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.70%	3.50%
CANADA
Net revenues	$ 6,294	$ 9,059
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	2.70%	3.60%
AUSTRALIA
Net revenues	$ 988	$ 3,087
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	0.40%	1.20%
TURKEY
Net revenues		$ 268
TURKEY | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue		0.10%
International [Member]
Net revenues	$ 138,399	$ 162,156
International [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	59.90%	64.10%

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