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Inventory (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Inventory [Line Items]      
Finished goods $ 22,361 $ 15,618  
Loss related to airtime inventory 0 1,298 $ 0
Wholesale Airtime Inventory Market [Member]      
Inventory [Line Items]      
Finished goods $ 16,500    
Loss related to airtime inventory   $ 1,300