Note 3 - Revenue - Contract Assets (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
Outstanding at January 1, 2019	$ 6,431	[1]
Transferred to receivables from contract assets recognized	(4,985)
Product transferred over time	5,782
Outstanding at June 30, 2019	$ 7,228

[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.