Note 14 - Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Recorded Tax Provision (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Computed federal income taxes at the statutory rate (benefit)	$ (3,681)	$ (4,826)	$ (2,457)
State income taxes (net of federal benefit)	63	39	53
Permanent tax differences	(122)	(262)	(415)
Foreign tax rates and tax credits differing from USA	763	887	4
Purchased goodwill impairment	828	1,072
Research and development credits	(202)
Net operating loss and other adjustment	(717)	(256)	216
Change in enacted tax rates applied to foreign deferred taxes	242	122	(38)
Change in valuation allowance	2,620	2,505	2,675
Change in enacted tax rates applied to USA deferred taxes		(887)
Total income tax (benefit) expense	$ (206)	$ (1,606)	$ 38