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Note 3 - Property and Equipment, Net (Tables)
6 Months Ended
Dec. 31, 2021
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   

December 31,

   

June 30,

 
   

2021

   

2021

 
                 

Land and building

  $ 1,250     $ 1,250  

Leasehold improvements

    1,371       1,364  

Machinery and equipment

    6,518       6,416  

Transportation equipment

    6       6  
      9,145       9,036  

Less: Accumulated depreciation and amortization

    (7,347 )     (7,294 )

Total

  $ 1,798     $ 1,742