Note 14 - Income Taxes - Effect of Temporary Differences (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accrued compensation	$ 42	$ 21
Inventory	47	3
Bad debt reserves	164	28
Product performance accrual	12	12
Non-qualified stock option compensation	236	229
Operating loss carryforwards	10,240	9,646
Fixed assets	137	134
Other	30	40
Total deferred tax assets before valuation allowance	10,908	10,113
Valuation allowance	(10,263)	(8,647)
Total deferred tax assets	645	1,466
Restricted stock compensation	(3)
Withholding tax	(306)	(698)
Foreign unremitted earnings	(642)	(1,466)
Total deferred tax liabilities	(951)	(2,164)
Total net deferred tax (liabilities)	$ (306)	$ (698)