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Inventories (Tables)
 3 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
Major components of inventories are summarized below. Of total net inventory values shown, 61 percent are under the last-in first-out (LIFO) method at September 30, 2017, and 65 percent at June 30, 2017.

(In thousands)
September 30, 2017
 
June 30,
2017
Raw materials
 
$
12,553

 
$
13,404

Work in process
 
10,841

 
8,665

Finished goods
 
1,159

 
1,111

 
 
24,553

 
23,180

Reserve for LIFO cost valuation
 
(1,290
)
 
(1,290
)
Inventories
 
$
23,263

 
$
21,890