XML 46 R28.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Quarterly Operating Results - Unaudited (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly financial information |
|  | (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 |

X
- References No definition available. + Details
Name: | us-gaap_QuarterlyFinancialInformationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1280-108306 + Details
Name: | us-gaap_ScheduleOfQuarterlyFinancialInformationTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration