Note 14 - Warrant Liabilities (Tables)

6 Months Ended

Jun. 30, 2023

Notes Tables

Schedule of Warrant Liabilities [Table Text Block]

	As of June 30, 2023		As of March 31, 2023		As of December 31, 2022		Change in Fair Value (gain)/loss
							Six Months Ended June 30, 2023			Three Months Ended June 30, 2023
	(US$’000)		(US$’000)		(US$’000)		(US$’000)			(US$’000)
Warrants issued in the 2021 Financing:
--Investor Warrants		12		49		86		(74	)		(37	)
--Placement Agent Warrants		1		5		9		(8	)		(4	)
Warrants issued in the 2020 Financing:
--Investor Warrants		-		25		76		(76	)		(25	)
--Placement Agent Warrants		-		5		14		(14	)		(5	)
Warrant Liabilities		13		84		185		(172	)		(71	)

	As of June 30, 2022		As of March 31, 2022		As of December 31, 2021		Change in Fair Value (gain)/loss
							Six Months Ended June 30, 2022			Three Months Ended June 30, 2022
	(US$’000)		(US$’000)		(US$’000)		(US$’000)			(US$’000)
Warrants issued in the 2021 Financing:
--Investor Warrants		167		626		964		(797	)		(459	)
--Placement Agent Warrants		22		84		132		(110	)		(62	)
Warrants issued in the 2020 Financing:
--Investor Warrants		57		449		795		(738	)		(392	)
--Placement Agent Warrants		11		85		148		(137	)		(74	)
Warrant Liabilities		257		1,244		2,039		(1,782	)		(987	)

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		1,001,343		1.36	$	15.11
Granted/Vested		-						-
Exercised		-						-
Balance, June 30, 2023 (Unaudited)		1,000,343		0.86	$	15.11		1,000,343		0.86	$	15.11

Warrant [Member]

Notes Tables

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

	2021 Investors Warrants									2021 Placement Agent Warrants
	June 30, 2023			March 31, 2023			December 31, 2022			June 30, 2023			March 31, 2023			December 31, 2022
Stock price	$	1.27		$	1.70		$	0.46#		$	1.27		$	1.70		$	0.46#
Years to maturity		1.13			1.38			1.63			1.13			1.38			1.63
Risk-free interest rate		5.34	%		4.44	%		4.625	%		5.34	%		4.44	%		4.625	%
Dividend yield		-			-			-			-			-			-
Expected volatility		112	%		113	%		99.74	%		112	%		113	%		99.74	%
Exercise Price	$	17.95		$	17.95		$	3.59#		$	22.4375		$	22.4375		$	4.4875#
Fair value of the warrant	$	0.0232		$	0.0937		$	0.0329		$	0.0157		$	0.0727		$	0.0256
Warrant Liabilities (US$’000)	$	12		$	49		$	86		$	1		$	5		$	9

	2021 Investors Warrants									2021 Placement Agent Warrants
	June 30, 2022			March 31, 2022			December 31, 2021			June 30, 2022			March 31, 2022			December 31, 2021
Stock price#	$	0.34		$	0.73		$	1.00		$	0.34		$	0.73		$	1.00
Years to maturity		2.13			2.38			2.63			2.13			2.38			2.63
Risk-free interest rate		2.97	%		2.35	%		0.87	%		2.97	%		2.35	%		0.87	%
Dividend yield		-			-			-			-			-			-
Expected volatility		124	%		121	%		115	%		124	%		121	%		115	%
Exercise Price#	$	3.59		$	3.59		$	3.59		$	4.4875		$	4.4875		$	4.4875
Fair value of the warrant	$	0.064		$	0.24		$	0.37		$	0.061		$	0.23		$	0.36
Warrant Liabilities (US$’000)	$	167		$	626		$	964		$	22		$	84		$	132

	2020 Investors Warrants									2020 Placement Agent Warrants
	June 30, 2023			March 31, 2023			December 31, 2022			June 30, 2023			March 31, 2023			December 31, 2022
Stock price	$	1.27		$	1.70		$	0.46#		$	1.27		$	1.70		$	0.46#
Years to maturity		0.45			0.70			0.95			0.45			0.70			0.95
Risk-free interest rate		5.46	%		4.80	%		4.716	%		5.46	%		4.80	%		4.716	%
Dividend yield		-			-			-			-			-			-
Expected volatility		94	%		125	%		115.61	%		94	%		125	%		115.61	%
Exercise Price	$	10.15		$	10.15		$	2.03#		$	10.15		$	10.15		$	2.03#
Fair value of the warrant	$	0.000		$	0.0731		$	0.0439		$	0.000		$	0.0760		$	0.0456
Warrant Liabilities (US$’000)	$	0		$	25		$	76		$	0		$	5		$	14

	2020 Investors Warrants									2020 Placement Agent Warrants
	June 30, 2022			March 31, 2022			December 31, 2021			June 30, 2022			March 31, 2022			December 31, 2021
Stock price#	$	0.34		$	0.73		$	1.00		$	0.34		$	0.73		$	1.00
Years to maturity		1.45			1.70			1.95			1.45			1.70			1.95
Risk-free interest rate		2.79	%		2.23	%		0.72	%		2.79	%		2.23	%		0.72	%
Dividend yield		-			-			-			-			-			-
Expected volatility		107	%		127	%		128	%		107	%		127	%		128	%
Exercise Price#	$	2.03		$	2.03		$	2.03		$	2.03		$	2.03		$	2.03
Fair value of the warrant	$	0.033		$	0.26		$	0.46		$	0.036		$	0.28		$	0.49
Warrant Liabilities (US$’000)	$	57		$	449		$	795		$	11		$	85		$	148