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Note 4 - Property and Equipment, Net (Tables)
12 Months Ended
Jun. 30, 2020
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
June 30,
 
   
2020
   
2019
 
                 
Land and building
  $
1,250
    $
1,250
 
Leasehold improvements
   
1,287
     
1,282
 
Machinery and equipment
   
6,465
     
6,280
 
Transportation equipment
   
6
     
6
 
     
9,008
     
8,818
 
Less: Accumulated depreciation and amortization
   
(7,312
)    
(7,040
)
Total
  $
1,696
    $
1,778