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Note 22 - Eersteling (Details Textual) - SH Minerals [member] - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
May 31, 2018
Mar. 29, 2020
Dec. 31, 2019
Jan. 31, 2020
Jul. 12, 2016
Statement Line Items [Line Items]          
Share sale agreement, once off payment         $ 3,000
Share sale agreement, amendment, purchase price $ 3,000        
Share sale agreement, amendment, amount of each payment $ 1,000        
Share sale agreement, amendment, amount of payment, received     $ 1,000    
Outstanding receivable from sale of subsidiaries     $ 1,000    
Sales agreement with Eersteling Gold Mining Company Limited [member]          
Statement Line Items [Line Items]          
Share sale agreement, amendment, amount of payment, received   $ 901      
Outstanding receivable from sale of subsidiaries       $ 99