Note 17 - Warrant Liabilities (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Schedule of Warrant Liabilities [Table Text Block]

							Change in Fair Value (gain)/loss
	As of June 30, 2020		As of March 31, 2020		As of December 31, 2019		Six Months Ended June 30, 2020			Three Months Ended June 30, 2020
Fair value of the Warrants:
Investor warrants		13		45		71		(58	)		(32	)
Placement agent warrants		26		16		36		(10	)		10
Warrant liabilities		39		61		107		(68	)		(22	)

							Change in Fair Value (gain)/loss
	As of June 30, 2019		As of March 31, 2019		As of December 31, 2018		Six Months Ended June 30, 2019			Three Months Ended June 30, 2019
Fair value of the Warrants:
Investor warrants		32		793		503		(471	)		(761	)
Placement agent warrants		103		163		103		-			(60	)
Warrant liabilities		135		956		606		(471	)		(821	)

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		-						-
Expired		-						-
Exercised		-						-
Balance, June 30, 2020 (Unaudited)		774,000		0.13	$	1.4927		774,000		0.13	$	1.4927

Warrant [Member]

Notes Tables

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

	Investors warrants									Placement agent warrants
	December 31, 2019			March 31, 2020			June 30, 2020			December 31, 2019			March 31, 2020			June 30, 2020
Stock price	$	1.17		$	0.95		$	1.00		$	1.17		$	0.95		$	1.00
Years to maturity		0.55			0.30			0.05			1.05			0.80			0.55
Risk-free interest rate		1.58	%		0.10	%		0.19	%		1.57	%		0.13	%		0.18	%
Dividend yield		-			-			-			-			-			-
Expected volatility		60	%		99	%		143	%		80	%		78	%		112	%
Exercise Price *	$	1.4927		$	1.4927		$	1.4927		$	1.4927		$	1.4927		$	1.4927
Fair value of the warrant	$	0.11		$	0.07		$	0.02		$	0.28		$	0.12		$	0.20
Warrant Liabilities (US$'000)	$	71		$	45		$	13		$	36		$	16		$	26

	Investors warrants									Placement agent warrants
	December 31, 2018			March 31, 2019			June 30, 2019			December 31, 2018			March 31, 2019			June 30, 2019
Stock price	$	1.34		$	1.95		$	1.35		$	1.34		$	1.95		$	1.35
Years to maturity		1.55			1.30			1.05			2.05			1.80			1.55
Risk-free interest rate		2.50	%		2.27	%		1.73	%		2.50	%		2.27	%		1.73	%
Dividend yield		-			-			-			-			-			-
Expected volatility		199	%		216	%		90	%		176	%		187	%		202	%
Exercise Price	$	6.60		$	6.60		$	6.60		$	6.60		$	6.60		$	6.60
Fair value of the warrant	$	0.78		$	1.23		$	0.05		$	0.80		$	1.26		$	0.80
Warrant Liabilities (US$'000)	$	503		$	793		$	32		$	103		$	163		$	103