Note 14 - Taxation - Reconciliation of the Income Tax (Expense)/Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Pre-tax loss	$ (5,078)	$ (1,221)
U.S. federal rate	21.00%	21.00%	21.00%
Income tax benefit computed at U.S. federal rate	$ 1,066	$ 256
Rate differential for foreign earnings	74	137
Preferential tax treatment effect	(205)	(109)
Tax effect on non-taxable change in fair value of warrant liabilities	137	105
Provision of valuation allowance on deferred tax assets	(917)	(177)
Expired tax attribute carryforwards	(372)	(253)
Tax effect on other non-deductible expenses/non-taxable income	74	(8)
Effective income tax expense	$ (143)	$ (49)