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Note 12 - Right-of-use Assets, Net and Lease Liabilities (Details Textual) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of maturity analysis of operating lease payments [line items]      
Leases paid in advance     $ 4.0
Expense relating to short-term leases for which recognition exemption has been used $ 1.7 $ 15.1  
Expense relating to leases of low-value assets for which recognition exemption has been used $ 3.2 $ 1.3  
Not later than one year [member]      
Disclosure of maturity analysis of operating lease payments [line items]      
Remaining lease payments to be made, percentage 16.90%    
Later than one year and not later than five years [member]      
Disclosure of maturity analysis of operating lease payments [line items]      
Remaining lease payments to be made, percentage 40.50%    
Later than five years [member]      
Disclosure of maturity analysis of operating lease payments [line items]      
Remaining lease payments to be made, percentage 42.60%