Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Customer shares	Dec. 31, 2017 USD ($) Customer shares	Dec. 31, 2016 USD ($) shares
Summary Of Significant Accounting Policies [Line Items]
Interest Costs Capitalized	$ 125		$ 575
Goodwill, Impairment Loss	0	$ 0
Foreign Currency Transaction Gains (Losses), Realized	$ 908	$ (550)	$ 306
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	537,163	521,096	558,499
Customer Concentration Risk [Member] | Accounts Receivable [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of Major Customers | Customer	1	1
Concentration Risk, Percentage	23.00%	12.00%
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Cash with European Union Banks	$ 20,000