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Note A - Basis of Presentation and Significant Accounting Policies (Tables)
12 Months Ended
Jun. 30, 2019
Accounting Standards Update 2017-07 [Member]  
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
 
 
For the Year Ended
 
   
June 30, 2018
   
Adoption
   
June 30, 2018
 
   
As Reported
   
Impact
   
Restated
 
Cost of goods sold
  $
160,497
    $
(405
)   $
160,092
 
Gross profit
   
80,236
     
405
     
80,641
 
Marketing, engineering and administrative expenses
   
61,909
     
(814
)    
61,095
 
Income from operations
   
14,929
     
1,219
     
16,148
 
Other income (expense), net
   
(282
)    
(1,219
)    
(1,501
)
Accounting Standards Update 2016-02 [Member]  
Notes Tables  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
   
June 30, 2018
   
Adoption
   
June 30, 2018
 
   
As Reported
   
Impact
   
Restated
 
Property, plant and equipment, net
  $
48,940
    $
6,527
    $
55,467
 
Lease obligations
   
-
     
6,527
     
6,527