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Note 6 - Pension and Post-retirement Benefits (Tables)
6 Months Ended
Dec. 31, 2015
Post Retirement Medical and Life Insurance Plan [Member]  
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
12/31/2015
(Unaudited)
   
12/31/2014
   
12/31/2015
(Unaudited)
   
12/31/2014
 
Service cost
  $ 27     $ 29     $ 53     $ 57  
Interest cost
    72       61       144       122  
Amortization of prior service credit
    (196
)
    (200
)
    (391
)
    (400
)
Amortization of net loss
    3               7          
    $ (94
)
  $ (110
)
  $ (187
)
  $ (221
)
Schedule of Net Benefit Costs [Table Text Block]
   
Three Months Ended
   
Six Months Ended
 
   
12/31/2015
(Unaudited)
   
12/31/2014
   
12/31/2015
(Unaudited)
   
12/31/2014
 
Service cost
  $ 715     $ 694     $ 1,429     $ 1,388  
Interest cost
    1,759       1,722       3,527       3,412  
Expected return on plan assets
    (1,585
)
    (1,772
)
    (3,179
)
    (3,512
)
Amortization of net loss
    12       7       26       14  
    $ 901     $ 651     $ 1,803     $ 1,302