Note 17 - Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Warrant Liabilities (US$’000)	$ 103	$ 255	$ 103	$ 255	$ 39	$ 107	$ 135	$ 606
Change in fair value of warrants	64	120	(4)	(351)
Investor Warrants [Member]
Warrant Liabilities (US$’000)		200		200	13	71	32	503
Change in fair value of warrants	(13)	168	(71)	(303)
Placement Agent Warrants [Member]
Warrant Liabilities (US$’000)	103	55	103	55	$ 26	$ 36	$ 103	$ 103
Change in fair value of warrants	$ 77	$ (48)	$ 67	$ (48)