Note 5 - Income Taxes - Income Taxes Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Provision for income taxes at federal statutory rate	$ 1,976	$ 638
Provision for income taxes at federal statutory rate, rate	21.00%	21.00%
State income taxes, net of federal benefit	$ 214	$ (73)
State income taxes, net of federal benefit, rate	2.30%	(2.40%)
Permanent differences	$ 251	$ (60)
Permanent differences, rate	2.60%	2.00%
Foreign tax rate differential	$ 717	$ 304
Foreign tax rate differential	7.60%	10.00%
GILTI tax	$ 527	$ 439
GILTI tax	5.60%	14.40%
Other	$ (107)	$ 154
Other, rate	1.10%	5.50%
Net expense	$ 3,578	$ 1,402
Net expense, rate	38.00%	46.50%