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Note 3 - Property and Equipment, Net (Tables)
3 Months Ended
Sep. 30, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
September 30,
   
June 30,
 
   
2018
   
2018
 
                 
Land and building
  $
1,250
    $
1,250
 
Leasehold improvements
   
1,268
     
1,268
 
Machinery and equipment
   
5,931
     
5,917
 
Transportation equipment
   
6
     
6
 
     
8,455
     
8,441
 
Less: Accumulated depreciation
               
         and amortization
   
(6,851
)    
(6,790
)
Total
  $
1,604
    $
1,651