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Quarterly Operating Results - Unaudited | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Operating Results - Unaudited | Note 9 - Quarterly Operating Results - Unaudited Operating results for each quarter of 2016 and 2015 are as follows:
|  | (Thousands of Dollars, Except per Share Data)
2016 |  | 1st |  | 2nd |  | 3rd |  | 4th |  | Total
Operating Revenues |  | $ | 30,579 |  |  | $ | 32,725 |  |  | $ | 37,754 |  |  | $ | 31,808 |  |  | $ | 132,906 |
Operating Income |  |  | 8,302 |  |  |  | 10,328 |  |  |  | 14,156 |  |  |  | 7,846 |  |  |  | 40,632 |
Net Income |  |  | 4,790 |  |  |  | 5,919 |  |  |  | 8,813 |  |  |  | 3,220 |  |  |  | 22,742 |
Basic Earnings per Share |  | $ | 0.29 |  |  | $ | 0.36 |  |  | $ | 0.54 |  |  | $ | 0.20 |  |  | $ | 1.39 |
Diluted Earnings per Share |  | $ | 0.29 |  |  | $ | 0.36 |  |  | $ | 0.54 |  |  | $ | 0.19 |  |  | $ | 1.38 |
2015 |  | 1st |  | 2nd |  | 3rd |  | 4th |  | Total
Operating Revenues |  | $ | 28,780 |  |  | $ | 31,666 |  |  | $ | 34,654 |  |  | $ | 30,925 |  |  | $ | 126,025 |
Operating Income |  |  | 6,685 |  |  |  | 9,235 |  |  |  | 11,460 |  |  |  | 8,460 |  |  |  | 35,840 |
Net Income |  |  | 3,636 |  |  |  | 5,089 |  |  |  | 6,743 |  |  |  | 4,560 |  |  |  | 20,028 |
Basic Earnings per Share |  | $ | 0.22 |  |  | $ | 0.31 |  |  | $ | 0.41 |  |  | $ | 0.29 |  |  | $ | 1.23 |
Diluted Earnings per Share |  | $ | 0.22 |  |  | $ | 0.31 |  |  | $ | 0.41 |  |  | $ | 0.28 |  |  | $ | 1.22 |
The information above, in the opinion of the Company, includes all adjustments consisting only of normal recurring accruals necessary for a fair presentation of such amounts. The business of the Company is subject to seasonal fluctuation with the peak period usually occurring during the summer months. The quarterly earnings per share amounts above may differ from previous filings due to the effects of rounding.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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