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Income Tax (tables) | 12 Months Ended
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Mar. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
6. Income Taxes |  |  |  |  |  |  |
The Company files a consolidated federal and various state income tax returns. The provision for income taxes is as follows: |
|  | 2017 |  | 2016 |  | 2015 |
|  | (In thousands) |
Current: |  |  |  |  |  |  |
Federal | $ | 395 | $ | 24,579 | $ | 4,380 |
State |  | 495 |  | 1,953 |  | 453 |
|  | 890 |  | 26,532 |  | 4,833 |
Deferred: |  |  |  |  |  |  |
Federal |  | 6,259 |  | (689) |  | (925) |
State |  | 265 |  | 156 |  | 313 |
|  | 6,524 |  | (533) |  | (612) |
Total income taxes | $ | 7,414 | $ | 25,999 | $ | 4,221 |
A reconciliation of the expected U.S. statutory rate to the effective rate follows: |
|  | 2017 |  | 2016 |  | 2015 |
Computed (expected tax rate) |  | 35.0 | % | 35.0 | % | 35.0 | %
State income taxes (net of federal tax benefit) |  | 4.1 |  | 2.7 |  | 2.9 |
State tax credits |  | (2.5) |  | (0.9) |  | (8.7) |
Federal credits |  | (1.8) |  | (0.4) |  | (2.4) |
Manufacturer’s deduction |  | (1.7) |  | (3.9) |  | (5.0) |
(Reversal of) addition to uncertain tax positions |  | 0.2 |  | 0.2 |  | (1.0) |
Other permanent differences not deductible |  | 2.4 |  | (0.2) |  | 0.7 |
Change in valuation allowance |  | 0.2 |  | 0.1 |  | 9.9 |
Other |  | 1.1 |  | (0.3) |  | (1.5) |
Effective income tax rate |  | 37.0 | % | 32.3 | % | 29.9 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | 2017 |  | 2016
|  | (In thousands)
Deferred income tax assets: |  |  |  |
Future tax credits | $ | 3,827 | $ | 3,807
Employee benefits |  | 3,119 |  | 3,174
Insurance |  | 924 |  | 881
Other comprehensive loss |  | 7,135 |  | 18,154
Interest |  | 32 |  | 21
Prepaid revenue |  | 444 |  | 571
Other |  | 472 |  | 2,804
Severance |  | - |  | 3
|  | 15,953 |  | 29,415
Deferred income tax liabilities: |  |  |  |
Property basis and depreciation difference |  | 12,786 |  | 9,330
481(a) adjustment |  | 429 |  | 880
Inventory valuation |  | 1,032 |  | 1,247
Intangibles |  | 213 |  | 235
Earnings from equity investment |  | 193 |  | 69
Pension |  | 3,590 |  | 2,896
|  | 18,243 |  | 14,657
Valuation allowance - non-current |  | 1,891 |  | 1,861
Net deferred income tax (liability) asset | $ | (4,181) | $ | 12,897
Summary of Income Tax Contingencies [Table Text Block] |
|  | 2017 |  | 2016
|  | (In thousands)
Beginning balance | $ | 694 | $ | 464
Tax positions related to current year: |  |  |  |
Additions |  | 67 |  | 291
Tax positions related to prior years: |  |  |  |
Additions |  | - |  | 241
Reductions |  | (46) |  | (7)
Settlements |  | - |  | (166)
Lapses in statues of limitations |  | - |  | (129)
Balance as of March 31, | $ | 715 | $ | 694

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32840-109319 + Details
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