Note 16 - The Financing and Warrant Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Allocation of Proceeds from Issuance of Equity [Table Text Block]

	Initial measurement
	the 2021 Financing		the 2020 Financing
	(USD’000)		(USD’000)
Investor Warrants		10,476		1,746
Common Stock (par value and additional paid in capital)		8,235		5,254
Total proceeds from the Financing		18,711		7,000

Schedule of Warrant Liabilities [Table Text Block]

	As of December 31, 2021		As of July 2, 2021		As of February 18, 2021		As of December 31, 2020		Change in Fair Value (Gain)/Loss
	(US$’000)		(US$’000)		(US$’000)		(US$’000)		(US$’000)
Warrants issued in the 2021 Financing:
--Investor warrants		964		*		10,476		*		(9,512	)
--Placement agent warrants		132		*		1,445		*		(1,313	)
Warrants issued in the 2020 Financing:
--Investor warrants		795		*		*		1,279		(484	)
--Placement agent warrants		148		*		*		224		(76	)
Warrants issued in the 2018 Financing:
--Investor warrants		-		*		*		-		-
--Placement agent warrants		-		58		*		2		56
Warrant liabilities		2,039						1,505		(11,329	)

	As of December 31, 2020		As of December 14, 2020		As of December 31, 2019		Change in Fair Value (Gain)/Loss
	(US$’000)		(US$’000)		(US$’000)		(US$’000)
Warrants issued in the 2020 Financing:
--Investor warrants		1,279		1,746		*		(467	)
--Placement agent warrants		224		305		*		(81	)
Warrants issued in the 2018 Financing:
--Investor warrants		-		*		71		(71	)
--Placement agent warrants		2		*		36		(34	)
Warrant liabilities		1,505				107		(653	)

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
Issued/Vested		2,030,865			3.00	$	2.03		-
Expired		(645,000	)			$	1.4927		(645,000	)			$	1.4927
Exercised		-							-
Balance, December 31, 2020		2,159,865			2.78	$	2.00		129,000			0.05	$	1.4927
Issued/Vested		2,970,840			2.63	$	3.70		5,001,705			2.36	$	3.02
Expired		-							-
Exercised		(129,000	)			$	1.4927		(129,000	)			$	1,4927
Balance, December 31, 2021		5,001,705			2.36	$	3.02		5,001,705			2.36	$	3.02

Warrant [Member]

Notes Tables

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

	As of February 18, 2021
	2021 Investor Warrants			2021 Placement Agent Warrants
Stock price	$	4.48		$	4.48
Years to maturity		3.50			3.50
Risk-free interest rate		0.26	%		0.26	%
Dividend yield		-			-
Expected volatility		168	%		168	%
Exercise Price	$	3.59		$	4.4875
Fair value of the warrant	$	4.02		$	3.96
Warrant liabilities (US$’000)	$	10,476		$	1,445

	As of December 14, 2020
	2020 Investor Warrants			2020 Placement Agent Warrants
Stock price	$	1.25		$	1.25
Years to maturity		3.00			3.00
Risk-free interest rate		0.17	%		0.17	%
Dividend yield		-			-
Expected volatility		164	%		164	%
Exercise Price	$	2.03		$	2.03
Fair value of the warrant	$	1.01		$	1.01
Warrant liabilities (US$’000)	$	1,746		$	305

	2021 Investor Warrants			2021 Placement Agent Warrants
	December 31, 2021			December 31, 2021
Stock price	$	1.00		$	1.00
Years to maturity		2.63			2.63
Risk-free interest rate		0.87	%		0.87	%
Dividend yield		-			-
Expected volatility		115	%		115	%
Exercise Price	$	3.59		$	4.4875
Fair value of the warrant	$	0.37		$	0.36
Warrant liabilities (US$’000)	$	964		$	132

	2020 Investor Warrants						2020 Placement Agent Warrants
	December 31, 2021			December 31, 2020			December 31, 2021			December 31, 2020
Stock price	$	1.00		$	1.35		$	1.00		$	1.35
Years to maturity		1.95			2.95			1.95			2.95
Risk-free interest rate		0.72	%		0.17	%		0.72	%		0.17	%
Dividend yield		-			-			-			-
Expected volatility		128	%		102	%		128	%		102	%
Exercise Price	$	2.03		$	2.03		$	2.03		$	2.03
Fair value of the warrant	$	0.46		$	0.74		$	0.49		$	0.74
Warrant liabilities (US$’000)	$	795		$	1,279		$	148		$	224

	2018 Investor Warrants					2018 Placement Agent Warrants
		December 31, 2020 (1)	December 31, 2019			July 2, 2021 (2)			December 31, 2020			December 31, 2019
Stock price			$	1.17		$	1.94		$	1.35		$	1.17
Years to maturity				0.55			0.04			0.05			1.05
Risk-free interest rate				1.58	%		0.05	%		0.08	%		1.57	%
Dividend yield				-			-			-			-
Expected volatility				60	%		75	%		59	%		80	%
Exercise Price			$	1.4927*		$	1.4927*		$	1.4927*		$	1.4927*
Fair value of the warrant			$	0.11		$	0.45		$	0.02		$	0.28
Warrant liabilities (US$’000)			$	71		$	58		$	2		$	36