Note 6 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2016	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Proceeds From Economic Incentive	$ 1,900			$ 0	$ 1,900
Interest Costs Capitalized		$ 1,600	$ 300	$ 3,500	$ 1,200