Note 20 - Income Taxes - Summary of Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Federal tax expense at the statutory rate	$ (4,004)	$ 2,220
Current year permanent differences	239	598
State income taxes, net of federal tax impact	(262)	528
Federal tax reform – deferred rate change	19,395	0
State deferred rate change	239	0
Foreign repatriation, net of foreign tax credits	(544)	165
Effect of tax rates of foreign subsidiaries	203	(51)
Currency translation effect on temporary differences	(372)	626
Change in valuation allowance	(15,230)	(6,256)
State NOL carryforwards, stock compensation and other items	(282)	2,471
Income tax (benefit) expense, net	$ (618)	$ 301