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BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Deferred assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Jun. 30, 2022
BUSINESS ACTIVITY AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES    
Inventory reserve $ 112 $ 122
Accumulated depreciation (5) (6)
Accumulated goodwill amortization (15) (12)
Accumulated intangible amortization   8
Accumulated intangible amortization (9)  
Unrealized loss (gain) on investments (38) 68
Deferred rent 5 6
Warranty reserve 17 5
Stock compensation 68 68
Net operating loss carryforward 636 594
Capital loss carry over 40  
Allowance for doubtful accounts 34 39
Net 845 892
Valuation allowance $ (845) $ (892)