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COMPOSITION OF CERTAIN FINANCIAL STATEMENT ITEMS (Tables)
12 Months Ended
Jun. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of investments
          
   June 30,
2022
   June 30,
2021
 
Marketable equity securities – short-term  $755   $1,295 
Marketable equity securities – long-term   1,779    1,704 
Total Marketable equity securities  $2,534   $2,999 
Schedule of inventory
          
   June 30, 
   2022   2021 
Raw materials /purchased components  $6,323   $3,967 
Work in process   3,463    2,218 
Sub-assemblies /finished components   2,118    1,738 
Finished goods   774    514 
Total inventory  $12,678   $8,437 
Schedule of Land and Building
          
   June 30,
2022
   June 30,
2021
 
Land  $3,684   $3,684 
Building   2,815    2,815 
Total   6,499    6,499 
Less: accumulated depreciation   (156)   (62)
   $6,343   $6,437 
Schedule of equipment and improvements
          
   June 30, 
   2022   2021 
Office furnishings and fixtures   $2,224   $2,173 
Machinery and equipment    6,661    5,895 
Automobiles    21    21 
Improvements    4,271    3,536 
Total    13,177    11,625 
Less: accumulated depreciation and amortization    (8,344)   (7,780)
   $4,833   $3,845 
Schedule of intangibles
          
   June 30,
2022
   June 30,
2021
 
Patent-related costs  $208   $260 
Less accumulated amortization   (90)   (74)
   $118   $186 
Schedule of accrued liabilities
          
   June 30, 
   2022   2021 
Payroll and related items   $509   $505 
Accrued inventory in transit    177    128 
Accrued legal and professional fees    275    124 
Accrued bonuses    430    300 
Current portion of lease liability    379    344 
Warranty    340    221 
Accrued customer rebate    517    394 
Other    124    182 
Total accrued expenses  $2,751   $2,198