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Note 18 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Jun. 30, 2018
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 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
  
September 2017
   $
51,818
     $
16,539
     $
640
     $
426
     $
0.06
  
December 2017
    
52,124
      
15,930
      
1,097
      
(6,521
)
    
(0.93
)
March 2018
    
54,834
      
18,072
      
2,337
      
1,637
      
0.23
  
June 2018
    
57,552
      
18,434
      
791
      
825
      
0.12
  
    $
216,328
     $
68,975
     $
4,865
     $
(3,633
)
   $
(0.52
)