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Note 4 - Change in Significant Accounting Policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
 [1]
Jan. 01, 2019
Statement Line Items [Line Items]        
Impairment loss recognised in profit or loss, trade receivables $ 0 $ 0 $ 181  
Bottom of range [member]        
Statement Line Items [Line Items]        
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16       4.00%
Top of range [member]        
Statement Line Items [Line Items]        
Weighted average lessee's incremental borrowing rate applied to lease liabilities recognised at date of initial application of IFRS 16       10.25%
[1] The Group initially applied IFRS 16 on January 1, 2019, using the modified retrospective approach. Under this approach, comparative information is not restated. There was no cumulative effect of initially applying IFRS 16 to recognise in retained earnings at the date of initial application.