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Note 10 - Fair Value Measurements (Tables)
 9 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
   
 
Carrying Value
    
Fair Value Measurements
Assets (Liabilities)
  
   
 
 
 
  
Level 1
   
Level 2
   
Level 3
 
   
(in thousands)
  
Assets (liabilities) as of March 31, 2019:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Trading securities held in a “rabbi trust” (1)
   $
11,338
     $
11,338
     $
-
     $
-
  
    $
11,338
     $
11,338
     $
-
     $
-
  
                                 
Assets (liabilities) as of July 1, 2018:
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Trading securities held in a “rabbi trust” (1)
   $
9,368
     $
9,368
     $
-
     $
-
  
    $
9,368
     $
9,368
     $
-
     $
-