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Note 9 - Retirement Plans (Tables) | 12 Months Ended
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Mar. 31, 2018
Notes Tables |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] |
|  | 2018 |  |  | 2017 |
|  | (In thousands) |
Change in Benefit Obligation |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 216,022 |  |  | $ | 214,036 |
Merge the Gray Plan into the Seneca Plan |  |  | 3,796 |  |  |  | - |
Service cost |  |  | 8,457 |  |  |  | 8,375 |
Interest cost |  |  | 8,125 |  |  |  | 7,633 |
Plan amendments |  |  | - |  |  |  | 92 |
Actuarial loss (gain) |  |  | 7,714 |  |  |  | (3,201 | )
Benefit payments and expenses |  |  | (7,980 | ) |  |  | (10,913 | )
Benefit obligation at end of year |  | $ | 236,134 |  |  | $ | 216,022 |
Change in Plan Assets |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 207,829 |  |  | $ | 176,238 |
Merge the Gray Plan into the Seneca Plan |  |  | 3,300 |  |  |  | - |
Actual gain on plan assets |  |  | 6,963 |  |  |  | 34,304 |
Employer contributions |  |  | 2,732 |  |  |  | 8,200 |
Benefit payments and expenses |  |  | (7,980 | ) |  |  | (10,913 | )
Fair value of plan assets at end of year |  | $ | 212,844 |  |  | $ | 207,829 |
Unfunded Status |  | $ | (23,290 | ) |  | $ | (8,193 | )
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  | 2018 |  |  | 2017 |
|  | (In thousands) |
Amounts Recognized in Accumulated Other Comprehensive Pre-Tax Loss |  |  |  |  |  |  |  |
Prior service cost |  | $ | (707 | ) |  | $ | (826 | )
Net loss |  |  | (33,415 | ) |  |  | (17,580 | )
Accumulated other comprehensive pre-tax loss |  | $ | (34,122 | ) |  | $ | (18,406 | )
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
|  | Pension and |
|  | post retirement plan |
|  | adjustments, net |
|  | of tax |
|  | (In thousands) |
Accumulated Other Comprehensive Loss |  |  |  |
Balance at March 31, 2017 |  | $ | (11,175 | )
Other comprehensive loss before reclassifications |  |  | (11,483 | )
Reclassified of certain tax effects of accumulated other comprehensive loss in connection with the new Tax Cuts and Jobs Act |  |  | (2,409 | )
Net current period other comprehensive loss |  |  | (13,892 | )
Balance at March 31, 2018 |  | $ | (25,067 | )
Schedule of Defined Benefit Plans Disclosures [Table Text Block] |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (In thousands) |
Service cost |  | $ | 8,457 |  |  | $ | 8,375 |  |  | $ | 10,502 |
Interest cost |  |  | 8,125 |  |  |  | 7,633 |  |  |  | 8,902 |
Expected return on plan assets |  |  | (15,050 | ) |  |  | (12,696 | ) |  |  | (11,685 | )
Amortization of net loss |  |  | 106 |  |  |  | 2,858 |  |  |  | 3,854 |
Prior service cost |  |  | 119 |  |  |  | 109 |  |  |  | 109 |
Net periodic benefit cost |  | $ | 1,757 |  |  | $ | 6,279 |  |  | $ | 11,682 |
Schedule of Assumptions Used [Table Text Block] |
|  | 2018 |  |  | 2017 |
Weighted Average Assumptions for Balance Sheet Liability at End of Year: |  |  |  |  |  |  |  |
Discount rate - projected benefit obligation |  |  | 4.14 | % |  |  | 4.35 | %
Expected return on plan assets |  |  | 7.25 | % |  |  | 7.25 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | %
Weighted Average Assumptions for Benefit Cost at Beginning of Year: |  |  |  |  |  |  |  |
Discount rate - pension expense |  |  | 4.35 | % |  |  | 4.34 | %
Discount rate - service cost |  |  | 4.58 | % |  |  | 4.67 | %
Discount rate - interest cost |  |  | 3.74 | % |  |  | 3.62 | %
Expected return on plan assets |  |  | 7.25 | % |  |  | 7.25 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.00 | %
Schedule of Allocation of Plan Assets [Table Text Block] |
|  | Target |  |  | Percentage of Plan |  |  |  |  |
|  | Allocation |  |  | Assets at March 31, |  |  |  |  |
|  | 2019 |  |  | 2018 |  |  | 2017 |
Plan Assets |  |  |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | 99 | % |  |  | 99 | % |  |  | 99 | %
Debt securities |  |  | - |  |  |  | - |  |  |  | - |
Real estate |  |  | - |  |  |  | - |  |  |  | - |
Cash |  |  | 1 | % |  |  | 1 | % |  |  | 1 | %
Total |  |  | 100 | % |  |  | 100 | % |  |  | 100 | %
|  | 2018 |  |  | 2017 |
|  | Market Value |  |  | Market Value |
|  | (In thousands) |
Assets by Industry Type |  |  |  |  |  |  |  |
Asset Category |  |  |  |  |  |  |  |
Cash and cash equivalents: |  |  |  |  |  |  |  |
Money market funds |  | $ | 595 |  |  | $ | 1,585 |
Total cash and cash equivalents |  |  | 595 |  |  |  | 1,585 |
Common equity securities: |  |  |  |  |  |  |  |
Materials |  |  | 10,685 |  |  |  | 10,952 |
Industrials |  |  | 21,738 |  |  |  | 25,383 |
Telecommunication services |  |  | 18,120 |  |  |  | 18,060 |
Consumer staples |  |  | 32,543 |  |  |  | 43,641 |
Energy |  |  | 20,017 |  |  |  | 16,110 |
Financials |  |  | 37,634 |  |  |  | 33,818 |
Health care |  |  | 20,702 |  |  |  | 17,587 |
Information technology |  |  | 19,945 |  |  |  | 13,887 |
Utilities |  |  | 30,865 |  |  |  | 26,806 |
Total common equity securities |  |  | 212,249 |  |  |  | 206,244 |
Total assets |  | $ | 212,844 |  |  | $ | 207,829 |
Schedule of Expected Contributions [Table Text Block] |
Expected Employer Contributions |  | $ | - |
Expected Employee Contributions |  |  | - |
Schedule of Expected Benefit Payments [Table Text Block] |
2019 |  | $ | 8,568 |
2020 |  |  | 9,201 |
2021 |  |  | 9,935 |
2022 |  |  | 10,586 |
2023 |  |  | 11,304 |
2024-2028 |  |  | 66,955 |

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