SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance Beginning of Year	$ 162	$ 132	$ 102
Charges to Expense	157	111	81
Write-offs /Recoveries	(127)	(81)	(51)
Balance End of Year	$ 192	$ 162	$ 132