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Note 5 - Income Taxes - Income Taxes Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Provision for income taxes at federal statutory rate	$ 1,947	$ 1,976
Provision for income taxes at federal statutory rate, rate	21.00%	21.00%
State income taxes, net of federal benefit	$ 144	$ 214
State income taxes, net of federal benefit, rate	1.60%	2.30%
Permanent differences	$ 56	$ 251
Permanent differences, rate	0.60%	2.60%
Foreign tax rate differential	$ 112	$ 717
Foreign tax rate differential, rate	1.20%	7.60%
GILTI tax	$ 344	$ 527
GILTI tax, rate	3.70%	5.60%
2018 and 2019 impact of high tax exception	$ (545)
2018 and 2019 impact of high tax exception, rate	5.90%	0.00%
Brazil deferred tax allowance release	$ (2,158)
Brazil deferred tax allowance release, rate	23.30%	0.00%
Other	$ 412	$ (107)
Other, rate	4.40%	1.10%
Net expense	$ 312	$ 3,578
Net expense, rate	3.30%	38.00%

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