Note 15 - Supplemental Cash Flow Information - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income taxes paid	$ 1,088	$ 7,173	$ 5,076
Interest paid	$ 2,724	$ 727	$ 694