Note 16 - The Financing and Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 31, 2018	Jan. 17, 2018
Proceeds allocated to warrant liabilities	$ 107	$ 606	$ 2,275
Change in fair value of warrants	(499)	(1,669)
Investor Warrants [Member]
Proceeds allocated to warrant liabilities	71	503	1,890	$ 1,890
Change in fair value of warrants	(432)	(1,387)
Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	36	103	$ 385	$ 385
Change in fair value of warrants	$ (67)	$ (282)