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Note 15 - Margin Call on Gold Hedge (Details Textual)
 1 Months Ended 12 Months Ended 31 Months Ended
Aug. 17, 2018
USD ($)
Feb. 29, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
 [1]
Dec. 31, 2016
USD ($)
Aug. 17, 2018
USD ($)
Statement Line Items [Line Items]            
Hedging gains (losses) for hedge of group of items with offsetting risk positions     $ (360,000) $ (435,000)  
Early settlement discount for gold price     1.25%      
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)      
Derivative contract for 15,000 ounces of Gold [member] | Commodity price risk [member]            
Statement Line Items [Line Items]            
Derivative contract, number of ounces of gold hedged   15,000        
Hedging instruments, protected, price   $ 1,050        
Hedging instruments, participation, price   $ 1,079        
Hedging gains (losses) for hedge of group of items with offsetting risk positions         $ (435,000)  
Term of derivative contract   180 days        
[1] Restated, refer note 4(a).