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Note 9 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Net revenues	$ 64,380	$ 58,994
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	100.00%	100.00%
UNITED STATES
Net revenues	$ 26,194	$ 23,353
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	40.70%	39.70%
BRAZIL
Net revenues	$ 18,082	$ 15,568
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	28.10%	26.40%
SOUTH AFRICA
Net revenues	$ 9,701	$ 9,198
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	15.10%	15.60%
MEXICO
Net revenues	$ 2,472	$ 2,410
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.80%	4.10%
CHINA
Net revenues	$ 2,677	$ 2,860
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	4.20%	4.80%
JAPAN
Net revenues	$ 1,553	$ 2,023
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	2.40%	3.40%
CANADA
Net revenues	$ 1,830	$ 1,647
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	2.80%	2.80%
INDIA
Net revenues	$ 1,406	$ 1,616
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	2.20%	2.70%
AUSTRALIA
Net revenues	$ 465	$ 319
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	0.70%	0.50%

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