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Note 6 - Pension and Post-retirement Benefits (Tables)
 3 Months Ended
Sep. 30, 2016
Post Retirement Medical and Life Insurance Plan [Member]  
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
  
   
9/30/2016
    
9/30/2015
  
Service cost
   $ 23     $ 26  
Interest cost
     68       72  
Amortization of prior service credit
     (168
)
     (195
)
Amortization of net loss
     30       4  
    $ (47
)
   $ (93
)
Pension Plan [Member]  
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
  
   
9/30/2016
    
9/30/2015
  
Service cost
   $ 791     $ 714  
Interest cost
     1,552       1,768  
Expected return on plan assets
     (1,306
)
     (1,594
)
Amortization of net loss
     28       14  
    $ 1,065     $ 902