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BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Warranty liabilities (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Jun. 30, 2022
BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Period of right to return defective products   3 years  
Product warranty liability, beginning of period $ 55,000 $ 55,000 $ 29,000
Accruals for warranties issued 61,000   60,000
Settlements made (66,000)   (34,000)
Product warranty liability, end of period $ 50,000 $ 50,000 $ 55,000
Maximum      
BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Warranty period   3 years  
Minimum      
BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES      
Warranty period   1 year