GOODWILL AND INTANGIBLE ASSETS - Schedule of intangible assets (Details) - USD ($) $ in Thousands	9 Months Ended
	Mar. 31, 2019	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,490	$ 5,236
Accumulated Amortization	(2,168)	(1,711)
Total	$ 3,322	3,525
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 3,007	3,007
Accumulated Amortization	(1,241)	(919)
Total	1,766	2,088
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,672	1,459
Accumulated Amortization	(465)	(390)
Total	$ 1,207	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	$ 424	383
Accumulated Amortization	(292)	(278)
Total	$ 132	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
Trade name
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 270	270
Accumulated Amortization	(106)	(77)
Total	$ 164	193
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117	117
Accumulated Amortization	(64)	(47)
Total	$ 53	$ 70