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Note 16 - Gold Hedge (Details Textual)
 1 Months Ended 5 Months Ended 12 Months Ended
Nov. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
 [1]
Statement Line Items [Line Items]          
Hedging gains (losses) for hedge of group of items with offsetting risk positions     $ (601,000) $ (360,000) [1]
Commodity price risk [member] | Derivative contract for 4,500 ounces of Gold [member]          
Statement Line Items [Line Items]          
Term of derivative contract   150 days      
Derivative contract, number of ounces of gold hedged   4,500      
Hedging instruments, protected, price   $ 1,250      
Hedging instruments, participation, price   $ 324,000      
Commodity price risk [member] | Derivative contract for 4,600 ounces of Gold [member]          
Statement Line Items [Line Items]          
Derivative contract, number of ounces of gold hedged 4,600        
Hedging instruments, protected, price $ 1,400        
Hedging instruments, participation, price $ 379,000        
Hedged item, assets     102,000 0  
Commodity price risk [member] | Derivative contract for 8,000 ounces of Gold [member]          
Statement Line Items [Line Items]          
Hedging gains (losses) for hedge of group of items with offsetting risk positions     $ (601,000) $ (360,000)  
[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.