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Note 18 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Jun. 30, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
Quarter Ended
 
Net
Sales
 
 
Gross
Margin
 
 
Earnings
Before
Income
Taxes
 
 
Net
Earnings /
(Loss)
 
 
Basic and
Diluted
Earnings
/ (Loss)
Per Share
 
September 2015
   $
51,038
     $
15,852
     $
482
     $
(178
)
   $
(0.03
)
December 2015
    
53,671
      
15,999
      
992
      
458
      
0.07
  
March 2016
    
50,329
      
14,733
      
1,199
      
597
      
0.09
  
June 2016
    
54,647
      
404
      
(23,048
)
    
(15,007
)
    
(2.14
)
    $
209,685
     $
46,988
     $
(20,375
)
   $
(14,130
)
   $
(2.01
)
September 2016
   $
48,913
     $
13,914
     $
1,476
     $
759
     $
0.11
  
December 2016
    
53,187
      
16,822
      
1,517
      
1,063
      
0.15
  
March 2017
    
50,670
      
14,479
      
(1,244
)
    
(786
)
    
(0.11
)
June 2017
    
54,253
      
16,735
      
(211
)
    
(45
)
    
(0.01
)
    $
207,023
     $
61,950
     $
1,538
     $
991
     $
0.14