Note 19 - The Financing and Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 17, 2018
Proceeds allocated to warrant liabilities	$ 606		$ 2,275
Change in fair value of warrants	(1,669)
Investor Warrants [Member]
Proceeds allocated to warrant liabilities	503		1,890
Change in fair value of warrants	(1,387)
Placement Agent Warrants [Member]
Proceeds allocated to warrant liabilities	103		$ 385
Change in fair value of warrants	$ (282)