Note 16 - Income Taxes - Reconciliation of the Federal Statutory Tax Rate to the Recorded Tax Provision (benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computed federal income taxes at the statutory rate (benefit)	$ (4,826)	$ (2,457)	$ (2,174)
State income taxes (net of federal benefit)	39	53	37
Permanent tax differences	(262)	(415)	(372)
Foreign tax rates and tax credits differing from USA	887	4	(60)
Purchased goodwill impairment	1,072
Net operating loss and other adjustment	(256)	216
Change in enacted tax rates applied to foreign deferred taxes	122	(38)	(114)
Change in valuation allowance	2,505	2,675	2,275
Change in enacted tax rates applied to USA deferred taxes	(887)
Total income tax (benefit) expense	$ (1,606)	$ 38	$ (408)