GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,788	$ 5,706
Accumulated Amortization	(3,549)	(2,935)
Net Amount	2,239	2,771
Intangible assets, amortization expense	$ 600	600	$ 600
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 3,007	3,007
Accumulated Amortization	(2,207)	(1,780)
Net Amount	800	1,227
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,974	1,892
Accumulated Amortization	(705)	(596)
Net Amount	$ 1,269	1,296
Permits | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	6 years
Permits | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	15 years
Patents
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 420	420
Accumulated Amortization	(327)	(311)
Net Amount	$ 93	109
Patents | Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Patents | Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	17 years
Tradename
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 270	270
Accumulated Amortization	(193)	(154)
Net Amount	$ 77	116
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117	117
Accumulated Amortization	(117)	(94)
Net Amount	$ 0	$ 23