Note 3 - Revenue From Contracts With Customers - Contract Liabilities (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Current contract liabilities		$ 2,226	$ 4,661
Long-term contract liabilities	[1]	129	84
Contract liabilities, beginning balance		2,355	4,745
Contract additions, net		1,033	1,279
Revenue recognized		(813)	(908)
Translation		35	146
Contract liabilities		2,610	5,262
Current contract liabilities		2,226	4,661	$ 2,453	$ 5,168
Long-term contract liabilities	[1]	$ 129	$ 84	$ 157	$ 94

[1] Long-term contract liabilities are included in Other long-term liabilities on the Condensed Consolidated Balance Sheets.