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Marketable Securities - Fair Value (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2021
Marketable Securities:          
Cost     $ 58    
Fair Value $ 5,245   5,245   $ 5,413
Unrealized Gain (Loss) (191) $ (42) (226) $ (42)  
Fair Value, Inputs, Level 1          
Marketable Securities:          
Cost     5,481   5,422
Fair Value $ 5,245   5,245   5,413
Unrealized Gain (Loss)     $ (236)   $ (9)