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Note 4 - Change in Significant Accounting Policies - Impact on Initial Date of Transition (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Statement Line Items [Line Items]      
Right of use assets (cost) – Property, plant and equipment (note 18) $ 337   $ 263
Lease liabilities – Trade and other payables $ 349    
IFRS 16 [Member]      
Statement Line Items [Line Items]      
Lease liabilities – Trade and other payables   $ 264  
IFRS 16 [Member] | Gross carrying amount [member]      
Statement Line Items [Line Items]      
Right of use assets (cost) – Property, plant and equipment (note 18)   410  
IFRS 16 [Member] | Accumulated depreciation and amortisation [member]      
Statement Line Items [Line Items]      
Right of use assets (cost) – Property, plant and equipment (note 18)   $ (146)