BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty liabilities (Details) - USD ($)	9 Months Ended	12 Months Ended
	Mar. 31, 2025	Jun. 30, 2024
Product Warranty Liability [Line Items]
Product warranty liability, beginning of period	$ 69,000	$ 53,000
Accruals for warranties issued	309,000	250,000
Settlements made	(337,000)	(234,000)
Product warranty liability, end of period	$ 41,000	$ 69,000
Minimum
Product Warranty Liability [Line Items]
Warranty period	1 year
Maximum
Product Warranty Liability [Line Items]
Warranty period	3 years
Period of right to return defective products	3 years