GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,706	$ 5,518
Accumulated Amortization	(2,935)	(2,322)
Net Amount	2,771	3,196
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	(1,780)	(1,348)
Net Amount	1,227	1,659
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,892	1,704
Accumulated Amortization	(596)	(492)
Net Amount	$ 1,296	1,212
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	(311)	(296)
Net Amount	$ 109	124
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	(154)	(116)
Net Amount	$ 116	154
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117	117
Accumulated Amortization	(94)	(70)
Net Amount	$ 23	$ 47