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COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Tables)
 3 Months Ended
Sep. 30, 2021
Composition Of Certain Financial Statement Items  
Schedule of investments
Schedule of investments          
   September 30,
2021		   June 30,
2021		 
Marketable equity securities - short-term  $1,506   $1,295 
Marketable equity securities - long-term   1,656    1,704 
Total marketable equity securities  $3,162   $2,999 
Schedule of inventory
Schedule of inventory          
   September 30,
2021		   June 30,
2021		 
Raw materials/purchased components  $3,856   $3,967 
Work in process   2,833    2,218 
Sub-assemblies/finished components   1,791    1,738 
Finished goods   427    514 
Total inventory  $8,907   $8,437 
Schedule of intangibles
Schedule of intangibles          
   September 30,
2021		   June 30,
2021		 
Patent-related costs  $272   $260 
Less accumulated amortization   (77)   (74)
   $195   $186