BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - warranty liabilities (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
|
| Product Warranty Liability [Line Items] | ||
| Period of right to return defective products | 3 years | |
| Product warranty liability beginning of period | $ 29,000 | $ 65,000 |
| Accruals for warranties issued | 60,000 | 29,000 |
| Change in estimates | (37,000) | |
| Settlements made | (34,000) | (28,000) |
| Product warranty liability end of the period | $ 55,000 | $ 29,000 |
| Maximum | ||
| Product Warranty Liability [Line Items] | ||
| Warranty period | 3 years | |
| Minimum | ||
| Product Warranty Liability [Line Items] | ||
| Warranty period | 1 year | |