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Note 9 - Pension and Post-retirement Benefits (Tables)
3 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Net Benefit Costs [Table Text Block]
   
Three
Months Ended
 
   
0
9
/3
0
/2019
   
0
9
/3
0
/2018
 
Service cost
  $
-
    $
-
 
Interest cost
   
1,349
     
1,506
 
Expected return on plan assets
   
(1,294
)
   
(1,284
)
Amortization of net loss
   
10
     
7
 
    $
65
    $
229
 
   
Three
Months Ended
 
   
0
9
/3
0
/2019
   
0
9
/3
0
/2018
 
Service cost
  $
18
    $
18
 
Interest cost
   
60
     
66
 
Amortization of prior service credit
   
(134
)
   
(134
)
Amortization of net loss
   
21
     
7
 
    $
(35
)
  $
(43
)