Note 13 - Capitalized Interest - Components of Interest Expense and Capitalized Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest cost incurred	$ 511	$ 521	$ 492
Interest cost capitalized - property and equipment	(9)	(21)	(25)
Interest expense, net	$ 502	$ 500	$ 467