Note 8 - Accrued Liabilities - Summary of Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Employee related expenses	$ 3,126	$ 4,827
Accrued discount	1,173	1,173
Corporate tax	1,042	105
Professional services	965	959
Royalties	83	1,291
Other accrued liabilities	2,101	2,041
Total accrued liabilities	$ 8,490	$ 10,396