GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,518	$ 5,236
Accumulated Amortization	(2,322)	(1,711)
Net Amount	3,196	3,525
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	(1,348)	(919)
Net Amount	1,659	2,088
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,704	1,459
Accumulated Amortization	(492)	(390)
Net Amount	$ 1,212	1,069
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	383
Accumulated Amortization	(296)	(278)
Net Amount	$ 124	105
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	(116)	(77)
Net Amount	$ 154	193
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117	117
Accumulated Amortization	(70)	(47)
Net Amount	$ 47	$ 70