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Long-Term Debt (tables) | 12 Months Ended
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Mar. 31, 2015
Long-term Debt, Unclassified [Abstract] |
Schedule of Long-term Debt Instruments [Table Text Block] |
4. Long-Term Debt |  |  |  |
|  | 2015 |  | 2014
|  | (In thousands)
Revolving credit facility, |  |  |  |
1.92% and 1.65%, due through 2017 | $ | 233,000 | $ | 175,000
Secured Industrial Revenue Development Bonds, |  |  |  |
2.97%, and 3.23%, due through 2029 |  | 22,630 |  | 22,630
Secured promissory note, |  |  |  |
6.98%, due through 2022 |  | 13,769 |  | 15,313
Secured promissory note, |  |  |  |
6.35%, due through 2020 |  | 3,122 |  | 3,731
Economic development note, |  |  |  |
2.00%, due through 2021 |  | 1,398 |  | 1,500
Other |  | 245 |  | 342
|  | 274,164 |  | 218,516
Less current portion |  | 2,530 |  | 2,277
| $ | 271,634 | $ | 216,239
Long Term Debt Repayement [table text block] |
Years ending March 31: |
2016 |  | $ | 2,530 |
2017 |  |  | 235,667 |
2018 |  |  | 7,904 |
2019 |  |  | 3,034 |
2020 |  |  | 2,531 |
Thereafter |  |  | 22,498 |
Total |  | $ | 274,164 |

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- Definition Tabular disclosure of a repayment requirments for the next five fiscal year for long term debt. + References No definition available. + Details
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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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