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Long-Term Debt (tables)
12 Months Ended
Mar. 31, 2016
Long-term Debt, Unclassified [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
4. Long-Term Debt
20162015
(In thousands)
Revolving credit facility,
1.95% and 1.92%, due through 2017$271,592$233,000
Secured Industrial Revenue Development Bonds,
3.02%, and 2.97%, due through 202922,63022,630
Secured promissory note,
6.98%, due through 202212,11413,769
Lease financing obligations,
2.62%, due through 20205,313-
Secured promissory note,
6.35%, due through 20202,4743,122
2.00%, due through 20211,2001,398
Other216245
315,539274,164
Less current portion279,5722,530
35,967271,634

Years ending March 31:
2017$279,572
20187,904
20193,034
20202,531
20217,019
Thereafter15,479
Total$315,539