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Note 9 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net revenues	$ 61,097	$ 61,348
BRAZIL
Net revenues	$ 12,300	$ 15,564
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	20.10%	25.40%
SOUTH AFRICA
Net revenues	$ 7,722	$ 6,914
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	12.60%	11.30%
MEXICO
Net revenues	$ 7,259	$ 5,847
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	11.90%	9.50%
CHINA
Net revenues	$ 3,263	$ 2,564
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	5.30%	4.20%
JAPAN
Net revenues	$ 2,450	$ 2,782
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	4.00%	4.50%
INDIA
Net revenues	$ 2,226	$ 2,291
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.60%	3.70%
CANADA
Net revenues	$ 1,878	$ 1,717
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.10%	2.80%
AUSTRALIA
Net revenues	$ 323	$ 380
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	0.50%	0.60%
International [Member]
Net revenues	$ 37,421	$ 38,059
International [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	61.10%	62.00%

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