Note 12 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net revenues	$ 255,719	$ 230,517
BRAZIL
Net revenues	$ 55,219	$ 49,940
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	21.60%	21.70%
SOUTH AFRICA
Net revenues	$ 35,498	$ 28,235
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	13.90%	12.20%
MEXICO
Net revenues	$ 22,459	$ 22,679
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	8.80%	9.80%
CHINA
Net revenues	$ 15,769	$ 12,401
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	6.20%	5.40%
JAPAN
Net revenues	$ 9,704	$ 9,273
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.80%	4.00%
INDIA
Net revenues	$ 7,058	$ 8,589
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	2.80%	3.70%
CANADA
Net revenues	$ 8,426	$ 6,294
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	3.30%	2.70%
AUSTRALIA
Net revenues	$ 1,260	$ 988
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	0.50%	0.40%
International [Member]
Net revenues	$ 155,393	$ 138,399
International [Member] | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	60.90%	59.90%