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Capitalization (Tables) | 12 Months Ended
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Dec. 31, 2015
Capitalization [Abstract] |
Schedule of maturities of long term debt |
Year |  | (Millions of Dollars) Annual Maturities
2016 | $ | 5.7
2017 | $ | 6.0
2018 | $ | 6.4
2019 | $ | 6.4
2020 | $ | 6.3
Schedule of earnings per share |
|  | (In Thousands, Except Per Share Amounts)
|  | 2015 |  | 2014 |  | 2013
Basic: |  | Income |  | Shares |  | Income |  | Shares |  | Income |  | Shares
Net Income |  | $ | 20,028 |  |  |  | 16,175 |  |  | $ | 18,445 |  |  |  | 16,052 |  |  | $ | 16,633 |  |  |  | 15,868 |
Preferred Dividend |  |  | (144 | ) |  |  |  |  |  |  | (151 | ) |  |  |  |  |  |  | (190 | ) |  |  |  |
Earnings Applicable to Common Stock |  | $ | 19,884 |  |  |  | 16,175 |  |  | $ | 18,294 |  |  |  | 16,052 |  |  | $ | 16,443 |  |  |  | 15,868 |
Basic EPS |  | $ | 1.23 |  |  |  |  |  |  | $ | 1.14 |  |  |  |  |  |  | $ | 1.04 |  |  |  |  |
Diluted: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Applicable to Common Stock |  | $ | 19,884 |  |  |  | 16,175 |  |  | $ | 18,294 |  |  |  | 16,052 |  |  | $ | 16,443 |  |  |  | 15,868 |
$7.00 Series Dividend |  |  | 67 |  |  |  | 115 |  |  |  | 74 |  |  |  | 133 |  |  |  | 97 |  |  |  | 166 |
$8.00 Series Dividend |  |  | 24 |  |  |  | 41 |  |  |  | 24 |  |  |  | 41 |  |  |  | 40 |  |  |  | 76 |
Adjusted Earnings Applicable to Common Stock |  | $ | 19,975 |  |  |  | 16,331 |  |  | $ | 18,392 |  |  |  | 16,226 |  |  | $ | 16,580 |  |  |  | 16,110 |
Diluted EPS |  | $ | 1.22 |  |  |  |  |  |  | $ | 1.13 |  |  |  |  |  |  | $ | 1.03 |  |  |  |  |
Schedule of carrying amount and estimated fair value of bonds |
|  | (Thousands of Dollars)
|  | At December 31,
|  | 2015 |  | 2014
|  | Carrying |  | Fair |  | Carrying |  | Fair
|  | Amount |  | Value |  | Amount |  | Value
Bonds |  | $ | 85,143 |  |  | $ | 87,972 |  |  | $ | 88,628 |  |  | $ | 90,115 |
State Revolving Notes |  | $ | 457 |  |  | $ | 459 |  |  | $ | 540 |  |  | $ | 542 |

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