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MARKETABLE EQUITY SECURITIES (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Marketable Securities      
Fair value changes in equity securities $ (1,375) $ (1,468)  
Investment value $ 15,000   $ 16,000
Contango      
Marketable Securities      
Investment shares owned (in shares) 809,744    
Rubicon      
Marketable Securities      
Investment shares owned (in shares) 3,949,575    
TriStar      
Marketable Securities      
Common stock that can be purchased by warrants (in shares) 11,784,000