Note 14 - Warrant Liabilities (Tables)

9 Months Ended

Sep. 30, 2023

Notes Tables

Schedule of Warrant Liabilities [Table Text Block]

							Change in Fair Value (gain)/loss
	As of September 30, 2023		As of June 30, 2023		As of December 31, 2022		Nine Months Ended September 30, 2023			Three Months Ended September 30, 2023
	(US$’000)		(US$’000)		(US$’000)		(US$’000)			(US$’000)
Warrants issued in the 2021 Financing:
--Investor Warrants		-		12		86		(86	)		(12	)
--Placement Agent Warrants		-		1		9		(9	)		(1	)
Warrants issued in the 2020 Financing:
--Investor Warrants		-		-		76		(76	)		-
--Placement Agent Warrants		-		-		14		(14	)		-
Warrant Liabilities		-		13		185		(185	)		(13	)

							Change in Fair Value (gain)/loss
	As of September 30, 2022		As of June 30, 2022		As of December 31, 2021		Nine Months Ended September 30, 2022			Three Months Ended September 30, 2022
	(US$’000)		(US$’000)		(US$’000)		(US$’000)			(US$’000)
Warrants issued in the 2021 Financing:
--Investor Warrants		782		167		964		(182	)		615
--Placement Agent Warrants		106		22		132		(26	)		84
Warrants issued in the 2020 Financing:
--Investor Warrants		328		57		795		(467	)		271
--Placement Agent Warrants		64		11		148		(84	)		53
Warrant Liabilities		1,280		257		2,039		(759	)		1,023

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, 2023		1,000,343		1.36	$	15.11		1,000,343		1.36	$	15.11
Granted/Vested		-						-
Exercised		-						-
Balance, September 30, 2023 (Unaudited)		1,000,343		0.61	$	15.11		1,000,343		0.61	$	15.11

Warrant [Member]

Notes Tables

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

	2021 Investors Warrants									2021 Placement Agent Warrants
	September 30, 2023			June 30, 2023			December 31, 2022			September 30, 2023			June 30, 2023			December 31, 2022
Stock price	$	0.91		$	1.27		$ 0.46#			$	0.91		$	1.27		$ 0.46#
Years to maturity		0.88			1.13			1.63			0.88			1.13			1.63
Risk-free interest rate		5.49	%		5.34	%		4.625	%		5.49	%		5.34	%		4.625	%
Dividend yield		-			-			-			-			-			-
Expected volatility		89	%		112	%		99.74	%		89	%		112	%		99.74	%
Exercise Price	$	17.95		$	17.95		$ 3.59#			$	22.4375		$	22.4375		$ 4.4875#
Fair value of the warrant	$	0.0002		$	0.0232		$	0.0329		$	0.0001		$	0.0157		$	0.0256
Warrant Liabilities (US$’000)	$	0		$	12		$	86		$	0		$	1		$	9

	2021 Investors Warrants									2021 Placement Agent Warrants
	September 30, 2022			June 30, 2022			December 31, 2021			September 30, 2022			June 30, 2022			December 31, 2021
Stock price	$	0.92		$	0.34		$	1.00		$	0.92		$	0.34		$	1.00
Years to maturity		1.88			2.13			2.63			1.88			2.13			2.63
Risk-free interest rate		4.16	%		2.97	%		0.87	%		4.16	%		2.97	%		0.87	%
Dividend yield		-			-			-			-			-			-
Expected volatility		127	%		124	%		115	%		127	%		124	%		115	%
Exercise Price	$	3.59		$	3.59		$	3.59		$	4.4875		$	4.4875		$	4.4875
Fair value of the warrant	$	0.297		$	0.064		$	0.37		$	0.287		$	0.061		$	0.36
Warrant Liabilities (US$’000)	$	782		$	167		$	964		$	106		$	22		$	132

	2020 Investors Warrants									2020 Placement Agent Warrants
	September 30, 2023			June 30, 2023			December 31, 2022			September 30, 2023			June 30, 2023			December 31, 2022
Stock price	$	0.91		$	1.27		$ 0.46#			$	0.91		$	1.27		$ 0.46#
Years to maturity		0.20			0.45			0.95			0.20			0.45			0.95
Risk-free interest rate		5.44	%		5.46	%		4.716	%		5.44	%		5.46	%		4.716	%
Dividend yield		-			-			-			-			-			-
Expected volatility		65	%		94	%		115.61	%		65	%		94	%		115.61	%
Exercise Price	$	10.15		$	10.15		$ 2.03#			$	10.15		$	10.15		$ 2.03#
Fair value of the warrant	$	0.000		$	0.000		$	0.0439		$	0.000		$	0.000		$	0.0456
Warrant Liabilities (US$’000)	$	0		$	0		$	76		$	0		$	0		$	14

	2020 Investors Warrants									2020 Placement Agent Warrants
	September 30, 2022			June 30, 2022			December 31, 2021			September 30, 2022			June 30, 2022			December 31, 2021
Stock price	$	0.92		$	0.34		$	1.00		$	0.92		$	0.34		$	1.00
Years to maturity		1.20			1.45			1.95			1.20			1.45			1.95
Risk-free interest rate		3.90	%		2.79	%		0.72	%		3.90	%		2.79	%		0.72	%
Dividend yield		-			-			-			-			-			-
Expected volatility		103	%		107	%		128	%		103	%		107	%		128	%
Exercise Price	$	2.03		$	2.03		$	2.03		$	2.03		$	2.03		$	2.03
Fair value of the warrant	$	0.195		$	0.033		$	0.46		$	0.211		$	0.036		$	0.49
Warrant Liabilities (US$’000)	$	328		$	57		$	795		$	64		$	11		$	148