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Note D - Other Comprehensive Loss (Tables)
 3 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
   
Three months ended September 30, 2018
  
   
Defined Benefit
Pension Plan
    
Unrealized
(Losses) Gains on
Cash Flow
Hedges
    
Total
  
                         
Balance as of June 30, 2018
   $
(387
)
   $
(191
)
   $
(578
)
                         
OCI/OCL before reclassifications
    
—
      
945
      
945
  
Amounts reclassified from OCI
    
—
      
(446
)
    
(446
)
                         
Tax effect of OCI activity
    
—
      
(116
)
    
(116
)
Net current period OCI/OCL
    
—
      
383
      
383
  
Balance as of September 30, 2018
   $
(387
)
   $
192
     $
(195
)
   
Three months ended September 30,
2017
  
   
Defined Benefit
Pension Plan
    
Unrealized Gains
(Losses) on Cash
Flow Hedges
    
Total
  
                         
Balance as of June 30, 2017
   $
(491
)
   $
(414
)
   $
(905
)
                         
OCI/OCL before reclassifications
    
—
      
(1,953
)
    
(1,953
)
Amounts reclassified from OCI
    
—
      
178
      
178
  
                         
Tax effect of OCI activity
    
—
      
641
      
641
  
Net current period OCI/OCL
    
—
      
(1,134
)
    
(1,134
)
Balance as of September 30, 2017
   $
(491
)
   $
(1,548
)
   $
(2,039
)