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Note 30 - Financial Instruments (Details Textual)
 12 Months Ended 31 Months Ended
Aug. 17, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Aug. 17, 2018
USD ($)
Statement Line Items [Line Items]          
Total trade and other current receivables   $ 6,392,000 $ 4,962,000    
Cash and cash equivalents denominated in RTGS   6,560,000 0    
Term loan denominated in RTGS   5,960,000 0    
Hedging gains (losses) for hedge of group of items with offsetting risk positions   (360,000) [1] $ (435,000)  
Derivative contract for 8,000 ounces of Gold [member] | Commodity price risk [member]          
Statement Line Items [Line Items]          
Derivative contract, number of ounces of gold hedged 8,000       8,000
Hedging instruments, protected, price $ 1,150        
Hedging instruments, participation, price $ 1,195       $ 1,195
Hedging gains (losses) for hedge of group of items with offsetting risk positions   (360,000)      
Current [member]          
Statement Line Items [Line Items]          
Total trade and other current receivables   $ 0      
[1] Restated, refer note 4(a).