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Note 5 - Income Taxes - Income Taxes Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Provision for income taxes at federal statutory rate	$ 638	$ 1,421
Provision for income taxes at federal statutory rate, rate	21.00%	34.00%
State income taxes, net of federal benefit	$ (73)	$ 17
State income taxes, net of federal benefit, rate	(2.40%)	0.40%
Permanent differences	$ (60)	$ 85
Permanent differences, rate	(2.00%)	2.10%
Federal Research and Development Credit		$ 41
Federal Research and Development Credit, rate		1.00%
Foreign tax rate differential	$ 304	$ (494)
Foreign tax rate differential	10.00%	(11.80%)
GILTI tax	$ 439	$ 798
GILTI tax	14.40%	19.00%
Reduction in deferred tax asset – Reduction of corporate tax rate		$ 1,043
Reduction in deferred tax asset – Reduction of corporate tax rate, rate		24.80%
Other	$ 154	$ 66
Other, rate	5.50%	1.70%
Net expense	$ 1,402	$ 2,977
Net expense, rate	46.50%	71.20%

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