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Note 21 - Disposal Group Held For Sale (Details Textual)
R in Millions
 1 Months Ended 12 Months Ended
May 31, 2018
USD ($)
Feb. 28, 2019
ZAR (R)
Feb. 28, 2019
USD ($)
May 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
Jul. 12, 2016
ZAR (R)
Jul. 12, 2016
USD ($)
Disposal groups classified as held for sale [member]                
Statement Line Items [Line Items]                
Cumulative income accounted for through other comprehensive income as part of the Foreign Currency Translation Reserve           $ 2,197,000    
SH Minerals [member]                
Statement Line Items [Line Items]                
Share sale agreement, nonrefundable deposit | R             R 5  
Share sale agreement, once off payment               $ 3,000,000
Share sale agreement, nonrefundable deposit, received         $ 2,000,000      
Share sale agreement, amendment, purchase price $ 3,000,000     $ 3,000,000        
Share sale agreement, amendment, amount of each payment $ 1,000,000     $ 1,000,000        
SH Minerals [member] | Sales agreement with Eersteling Gold Mining Company Limited [member]                
Statement Line Items [Line Items]                
Share sale agreement, amendment, amount of payment, received   R 13 $ 1,000,000