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Note 10 - Segment Information - Geographic Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Net revenues	$ 67,799	$ 67,176	$ 126,794	$ 128,273
Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	100.00%	100.00%	100.00%	100.00%
UNITED STATES
Net revenues	$ 31,577	$ 27,252	$ 54,931	$ 50,928
UNITED STATES | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Percent of consolidated net revenue	46.50%	40.60%	43.30%	39.60%
BRAZIL
Net revenues	$ 17,032	$ 13,596
BRAZIL | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 32,600	$ 25,897
Percent of consolidated net revenue	25.10%	20.20%	25.70%	20.20%
SOUTH AFRICA
Net revenues	$ 9,138	$ 8,524
SOUTH AFRICA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 18,336	$ 16,246
Percent of consolidated net revenue	13.50%	12.70%	14.50%	12.70%
MEXICO
Net revenues	$ 2,347	$ 8,363
MEXICO | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 4,757	$ 15,622
Percent of consolidated net revenue	3.50%	12.40%	3.80%	12.20%
CHINA
Net revenues	$ 1,610	$ 3,195
CHINA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 4,470	$ 6,458
Percent of consolidated net revenue	2.40%	4.80%	3.50%	5.00%
JAPAN
Net revenues	$ 1,788	$ 2,538
JAPAN | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 3,811	$ 4,988
Percent of consolidated net revenue	2.60%	3.80%	3.00%	3.90%
CANADA
Net revenues	$ 2,318	$ 2,040
CANADA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 3,965	$ 3,918
Percent of consolidated net revenue	3.40%	3.00%	3.10%	3.10%
INDIA
Net revenues	$ 1,595	$ 1,358
INDIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 3,211	$ 3,584
Percent of consolidated net revenue	2.40%	2.00%	2.50%	2.80%
AUSTRALIA
Net revenues	$ 394	$ 310
AUSTRALIA | Geographic Concentration Risk [Member] | Revenue Benchmark [Member]
Net revenues			$ 713	$ 633
Percent of consolidated net revenue	0.60%	0.50%	0.60%	0.50%

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