GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($)	3 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2018
Finite-Lived Intangible Assets [Line Items]
Original Amount	$ 5,399,000		$ 5,236,000
Accumulated Amortization	(1,863,000)		(1,711,000)
Total	3,536,000		3,525,000
Intangible assets, amortization expense	200,000	$ 200,000
Changes in goodwill	0
Future amortization of intangible assets [Abstract]
2019	643,000
2020	634,000
2021	627,000
2022	599,000
2023	441,000
Thereafter	592,000
Total	$ 3,536,000		3,525,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	7 years
Original Amount	$ 3,007,000		3,007,000
Accumulated Amortization	(1,026,000)		(919,000)
Total	1,981,000		2,088,000
Future amortization of intangible assets [Abstract]
Total	1,981,000		2,088,000
Permits
Finite-Lived Intangible Assets [Line Items]
Original Amount	1,610,000		1,459,000
Accumulated Amortization	(416,000)		(390,000)
Total	1,194,000		1,069,000
Future amortization of intangible assets [Abstract]
Total	$ 1,194,000		1,069,000
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	$ 395,000		383,000
Accumulated Amortization	(281,000)		(278,000)
Total	114,000		105,000
Future amortization of intangible assets [Abstract]
Total	$ 114,000		105,000
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	$ 270,000		270,000
Accumulated Amortization	(87,000)		(77,000)
Total	183,000		193,000
Future amortization of intangible assets [Abstract]
Total	$ 183,000		193,000
Non-compete
Finite-Lived Intangible Assets [Line Items]
Estimated Useful Lives	5 years
Original Amount	$ 117,000		117,000
Accumulated Amortization	(53,000)		(47,000)
Total	64,000		70,000
Future amortization of intangible assets [Abstract]
Total	$ 64,000		$ 70,000