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Note 18 - Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Jun. 30, 2019
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 2017
   $
51,818
     $
16,685
     $
640
     $
426
     $
0.06
  
December 2017
    
52,124
      
16,076
      
1,097
      
(6,521
)
    
(0.93
)
March 2018
    
54,834
      
18,217
      
2,337
      
1,637
      
0.23
  
June 2018
    
57,552
      
18,579
      
791
      
825
      
0.12
  
    $
216,328
     $
69,557
     $
4,865
     $
(3,633
)
   $
(0.52
)
September 2018
   $
51,901
     $
16,659
     $
942
     $
584
     $
0.08
  
December 2018
    
56,532
      
18,548
      
2,991
      
1,926
      
0.27
  
March 2019
    
58,498
      
19,155
      
3,045
      
2,088
      
0.30
  
June 2019
    
61,091
      
20,579
      
2,632
      
1,481
      
0.22
  
    $
228,022
     $
74,941
     $
9,610
     $
6,079
     $
0.87