Note 17 - Warrant Liabilities (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Schedule of Warrant Liabilities [Table Text Block]

		As of March 31, 2020		As of December 31, 2019		Change in Fair Value (gain)/loss
	US$’000		US$’000		US$’000
Fair value of the Warrants:
Investor warrants		45		71		(26	)
Placement agent warrants		16		36		(20	)
Warrant liabilities		61		107		(46	)

		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

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, 2020		774,000	0.63	$	1.4927		774,000	0.63	$	1.4927
Granted/Vested		-					-
Forfeited		-					-
Exercised		-					-
Balance, March 31, 2020 (Unaudited)		774,000	0.38	$	1.4927		774,000	0.38	$	1.4927

Warrant [Member]

Notes Tables

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

	Investors warrants						Placement agent warrants
		As of December 31, 2019			As of March 31, 2020			As of December 31, 2019			As of March 31, 2020
Stock price	$	1.17		$	0.95		$	1.17		$	0.95
Years to maturity		0.55			0.30			1.05			0.80
Risk-free interest rate		1.58	%		0.10	%		1.57	%		0.13	%
Dividend yield		-			-			-			-
Expected volatility		60	%		99	%		80	%		78	%
Exercise Price *	$	1.4927		$	1.4927		$	1.4927		$	1.4927
Fair value of the warrant	$	0.11		$	0.07		$	0.28		$	0.12
Warrant Liabilities (US$’000)	$	71		$	45		$	36		$	16

	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
Warrant Liabilities (US$’000)	$	503		$	793		$	103		$	163