Note 16 - Warrant Liabilities (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

Schedule of Warrant Liabilities [Table Text Block]

	As of March 31, 2019	As of December 31, 2018	Change in Fair Value (gain)/loss
	US$’000	US$’000	US$’000
Fair value of the Warrants:
Investor warrants	793	503	290
Placement agent warrants	163	103	60
Warrant liabilities	956	606	350

	As of March 31, 2018	As of January 17, 2018	Change in Fair Value (gain)/loss
	US$’000	US$’000	US$’000
Fair value of the Warrants:
Investor warrants	664	1,890	(1,226	)
Placement agent warrants	137	385	(248	)
Warrant liabilities	801	2,275	(1,474	)

Schedule of Warrant Activity [Table Text Block]

	Warrant Outstanding					Warrant Exercisable
		Number of underlying shares	Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price		Number of underlying shares	Weighted Average Remaining Contractual Life (Years)		Weighted Average Exercise Price
Balance, January 1, 2019		774,000	1.63	$	6.60		774,000	1.63	$	6.60
Granted/Vested		-					-
Forfeited		-					-
Exercised		-					-
Balance, March 31, 2019 (Unaudited)		774,000	1.38	$	6.60		774,000	1.38	$	6.60

Warrant [Member]

Notes Tables

Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]

	Investors warrants						Placement agent warrants
		As of December 31, 2018			As of March 31, 2019			As of December 31, 2018			As of March 31, 2019
Stock price	$	1.34		$	1.95		$	1.34		$	1.95
Years to maturity		1.55			1.30			2.05			1.80
Risk-free interest rate		2.50	%		2.27	%		2.50	%		2.27	%
Dividend yield		-			-			-			-
Expected volatility		199	%		216	%		176	%		187	%
Exercise Price	$	6.60		$	6.60		$	6.60		$	6.60
Fair value of the warrant	$	0.78		$	1.23		$	0.80		$	1.26

	Investors warrants						Placement agent warrants
		As of January 17, 2018			As of March 31, 2018			As of January 17, 2018			As of March 31, 2018
Stock price	$	3.98		$	1.67		$	3.98		$	1.67
Years to maturity		2.5			2.3			3.0			2.8
Risk-free interest rate		2.22	%		2.35	%		2.39	%		2.50	%
Dividend yield		-			-			-			-
Expected volatility		158	%		164	%		147	%		152	%
Exercise Price	$	6.60		$	6.60		$	6.60		$	6.60
Fair value of the warrant	$	2.93		$	1.03		$	2.99		$	1.06