Note 9 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Net revenues	$ 65,936	$ 67,799	$ 130,316	$ 126,794
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Net revenues	$ 26,088	$ 31,577	$ 52,281	$ 54,931
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	39.60%	46.50%	40.10%	43.30%
BRAZIL
Net revenues	$ 20,016	$ 17,032
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 38,098	$ 32,600
Percent of consolidated net revenue	30.40%	25.10%	29.20%	25.70%
SOUTH AFRICA
Net revenues	$ 8,195	$ 9,138
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 17,897	$ 18,336
Percent of consolidated net revenue	12.40%	13.50%	13.70%	14.50%
MEXICO
Net revenues	$ 2,559	$ 2,347
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 5,032	$ 4,757
Percent of consolidated net revenue	3.90%	3.50%	3.90%	3.80%
CHINA
Net revenues	$ 2,225	$ 1,610
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 4,901	$ 4,470
Percent of consolidated net revenue	3.40%	2.40%	3.80%	3.50%
JAPAN
Net revenues	$ 1,491	$ 1,788
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 3,044	$ 3,811
Percent of consolidated net revenue	2.20%	2.60%	2.40%	3.00%
CANADA
Net revenues	$ 3,420	$ 2,318
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 5,250	$ 3,965
Percent of consolidated net revenue	5.20%	3.40%	4.00%	3.10%
INDIA
Net revenues	$ 1,437	$ 1,595
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 2,843	$ 3,211
Percent of consolidated net revenue	2.10%	2.40%	2.20%	2.50%
AUSTRALIA
Net revenues	$ 505	$ 394
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 970	$ 713
Percent of consolidated net revenue	0.80%	0.60%	0.70%	0.60%