Note 10 - Long-term Obligations - Schedule of Interest Components of 6.25% Notes Contained in Company's Consolidated Statements of Comprehensive Income (Loss) (Details) - 6.25% Convertible Notes Due 2018 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Coupon interest expense	$ 208	$ 2,163
Amortization of the debt discount	18	2,253
Total included in interest expense	$ 226	$ 4,416