Note 8 - Property, Plant and Equipment (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interest Paid, Capitalized, Investing Activities	$ 1,379	$ 2,001
Construction in Progress [Member]
Interest Paid, Capitalized, Investing Activities	$ 1,379	$ 2,001
Capitalization Rates	6.47%	7.29%