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MARKETABLE EQUITY SECURITIES (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Jun. 30, 2019
Marketable Securities          
Fair value changes in equity securities $ (3,819) $ 1,781 $ (4,972) $ (3,318)  
Investment value $ 11,500   $ 11,500   $ 16,000
Contango          
Marketable Securities          
Investment shares owned (in shares) 809,744   809,744    
Rubicon          
Marketable Securities          
Investment shares owned (in shares) 3,949,575   3,949,575    
TriStar          
Marketable Securities          
Common stock that can be purchased by warrants (in shares) 19,640,000   19,640,000