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Note 7 - Pension and Post-retirement Benefits (Tables)
 3 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
  
   
9/30/2017
    
9/30/2016
  
Service cost
   $
-
     $
791
  
Interest cost
    
1,511
      
1,552
  
Expected return on plan assets
    
(1,285
)
    
(1,306
)
Amortization of net loss
    
6
      
28
  
    $
232
     $
1,065
  
   
Three Months Ended
  
   
9/30/2017
    
9/30/2016
  
Service cost
   $
21
     $
23
  
Interest cost
    
67
      
68
  
Amortization of prior service credit
    
(134
)
    
(168
)
Amortization of net loss
    
25
      
30
  
    $
(21
)
   $
(47
)