Note 17 - Warrant Liabilities - Warrant Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Warrant Liabilities (US$’000)	$ 39	$ 135	$ 39	$ 135	$ 61	$ 107	$ 956	$ 606
Change in fair value of warrants	(22)	(821)	(68)	(471)
Investor Warrants [Member]
Warrant Liabilities (US$’000)	13	32	13	32	45	71	793	503
Change in fair value of warrants	(32)	(761)	(58)	(471)
Placement Agent Warrants [Member]
Warrant Liabilities (US$’000)	26	103	26	103	$ 16	$ 36	$ 163	$ 103
Change in fair value of warrants	$ 10	$ (60)	$ (10)