Quarterly report pursuant to Section 13 or 15(d)

Segment Information (Details) - Schedule of oil extraction and processing segment

v3.21.2
Segment Information (Details) - Schedule of oil extraction and processing segment - Segements [Member] - USD ($)
$ in Thousands
May 31, 2020
May 31, 2019
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Additions to non-current assets $ 2,762 $ 18,651
Reportable segment assets 75,006 56,946
Reportable segment liabilities 19,173 10,753
Oil Extraction [Member]    
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Additions to non-current assets 2,152 7,851
Reportable segment assets 41,103 37,291
Reportable segment liabilities 18,173 10,584
Mining Operations [Member]    
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Additions to non-current assets 610 10,800
Reportable segment assets 33,903 19,655
Reportable segment liabilities $ 1,000 $ 169