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COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Tables)
 3 Months Ended
Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of investments
        
   September 30,
2022		   June 30,
2022		 
Marketable equity securities - short-term  $813   $755 
Marketable equity securities - long-term   1,889    1,779 
Total marketable equity securities  $2,702   $2,534 
Schedule of inventory
          
   September 30,
2022		   June 30,
2022		 
Raw materials/purchased components  $7,641   $6,323 
Work in process   4,104    3,463 
Sub-assemblies/finished components   2,183    2,118 
Finished goods   1,736    774 
Total inventory  $15,664   $12,678 
Schedule of intangibles
          
   September 30,
2022		   June 30,
2022		 
Patent-related costs  $208   $208 
Less accumulated amortization   (100)   (90)
   $108   $118