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Note 10 - Other Income (Details Textual)
$ in Thousands, R in Millions
 1 Months Ended 11 Months Ended 12 Months Ended
Mar. 06, 2019
Jan. 31, 2018
Dec. 31, 2018
Dec. 31, 2019
ZAR (R)
Dec. 31, 2019
USD ($)
Dec. 31, 2017
Statement Line Items [Line Items]            
Government grants, export incentive on gold   2.50% 10.00%     3.50%
Income from pension benefits fund surplus pay-out       R 3.6 $ 250  
Blanket Mine [member]            
Statement Line Items [Line Items]            
Gross, gold, price per kilogram 44,000          
Gross, gold, price per ounce 1,368.58