Note 9 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net revenues	$ 67,333	$ 69,832	$ 197,649	$ 196,626
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Net revenues	$ 28,722	$ 32,475	$ 81,004	$ 87,406
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	42.70%	46.50%	41.00%	44.50%
BRAZIL
Net revenues	$ 18,619	$ 16,904
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 56,717	$ 49,504
Percent of consolidated net revenue	27.70%	24.20%	28.70%	25.20%
SOUTH AFRICA
Net revenues	$ 7,863	$ 8,947
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 25,759	$ 27,283
Percent of consolidated net revenue	11.70%	12.80%	13.00%	13.90%
MEXICO
Net revenues	$ 3,033	$ 2,375
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 8,065	$ 7,132
Percent of consolidated net revenue	4.50%	3.40%	4.10%	3.60%
CHINA
Net revenues	$ 2,205	$ 3,460
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 7,106	$ 7,930
Percent of consolidated net revenue	3.30%	5.00%	3.60%	4.00%
JAPAN
Net revenues	$ 1,489	$ 1,725
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 4,533	$ 5,536
Percent of consolidated net revenue	2.20%	2.50%	2.30%	2.80%
CANADA
Net revenues	$ 3,421	$ 2,707
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 8,671	$ 5,949
Percent of consolidated net revenue	5.10%	3.90%	4.40%	3.00%
INDIA
Net revenues	$ 1,577	$ 831
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 4,420	$ 4,765
Percent of consolidated net revenue	2.20%	1.10%	2.20%	2.40%
AUSTRALIA
Net revenues	$ 404	$ 408
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 1,374	$ 1,121
Percent of consolidated net revenue	0.60%	0.60%	0.70%	0.60%