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Note 2 - Segment Information (Tables)
 3 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Segment Reporting Information, by Segment [Table Text Block]
   
North American

Operations
    
International Operations
    
Unallocated
    
Total
  
Three Months ended
September 30, 2018
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Sales
1
  $
30,200
     $
21,701
     $
-
     $
51,901
  
Operating Income (Loss)
   $
230
     $
2,094
     $
(1,556
)
   $
768
  
                                 
Three Months ended
September 30, 2017
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Sales
2
   $
29,718
     $
22,100
     $
-
     $
51,818
  
Operating Income (Loss)
   $
1,349
     $
757
     $
(1,657
)
   $
449