GOODWILL AND INTANGIBLE ASSETS - Schedule of intangible assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2020	Jun. 30, 2019
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,639	$ 5,518
Accumulated Amortization	(2,782)	(2,322)
Total	$ 2,857	3,196
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 3,007	3,007
Accumulated Amortization	(1,670)	(1,348)
Total	1,337	1,659
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,825	1,704
Accumulated Amortization	(571)	(492)
Total	$ 1,254	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	(308)	(296)
Total	$ 112	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
Trade name
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 270	270
Accumulated Amortization	(145)	(116)
Total	$ 125	154
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117	117
Accumulated Amortization	(88)	(70)
Total	$ 29	$ 47