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Note 11 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net revenues	$ 69,832	$ 67,423	$ 196,626	$ 195,696
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Net revenues	$ 32,475	$ 28,696	$ 87,406	$ 79,624
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	46.50%	42.60%	44.50%	40.70%
BRAZIL
Net revenues	$ 16,904	$ 14,913
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 49,504	$ 40,809
Percent of consolidated net revenue	24.20%	22.10%	25.20%	20.90%
SOUTH AFRICA
Net revenues	$ 8,947	$ 9,653
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 27,283	$ 25,899
Percent of consolidated net revenue	12.80%	14.30%	13.90%	13.20%
MEXICO
Net revenues	$ 2,375	$ 4,307
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 7,132	$ 19,929
Percent of consolidated net revenue	3.40%	6.40%	3.60%	10.20%
CHINA
Net revenues	$ 3,460	$ 3,735
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 7,930	$ 10,193
Percent of consolidated net revenue	5.00%	5.50%	4.00%	5.20%
JAPAN
Net revenues	$ 1,725	$ 2,348
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 5,536	$ 7,336
Percent of consolidated net revenue	2.50%	3.50%	2.80%	3.70%
CANADA
Net revenues	$ 2,707	$ 1,650
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 5,949	$ 4,886
Percent of consolidated net revenue	3.90%	2.40%	3.00%	2.50%
INDIA
Net revenues	$ 831	$ 1,933
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 4,765	$ 6,199
Percent of consolidated net revenue	1.10%	2.90%	2.40%	3.20%
AUSTRALIA
Net revenues	$ 408	$ 188
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 1,121	$ 821
Percent of consolidated net revenue	0.60%	0.30%	0.60%	0.40%

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