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SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables) | 12 Months Ended
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Dec. 31, 2020
SELECTED CONSOLIDATED QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract] |
Quarterly Unaudited Consolidated Statements of Operations | The following table is derived from quarterly unaudited consolidated statements of operations for the years ended December 31, 2020 and 2019. Quarterly basic and diluted per share amounts may not add to the full year total due to rounding.
|  | First Quarter |  |  | Second Quarter |  |  | Third Quarter |  |  | Fourth Quarter |
In thousands (except per share data) |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Operating revenues |  | $ | 19,901 |  |  | $ | 19,386 |  |  | $ | 21,752 |  |  | $ | 20,652 |  |  | $ | 24,737 |  |  | $ | 22,549 |  |  | $ | 21,751 |  |  | $ | 21,008 |
Operating income |  | $ | 4,462 |  |  | $ | 4,284 |  |  | $ | 6,124 |  |  | $ | 5,320 |  |  | $ | 6,869 |  |  | $ | 5,730 |  |  | $ | 4,840 |  |  | $ | 4,591 |
Net income applicable to common stock |  | $ | 4,074 |  |  | $ | 3,590 |  |  | $ | 4,566 |  |  | $ | 3,778 |  |  | $ | 5,063 |  |  | $ | 4,458 |  |  | $ | 3,114 |  |  | $ | 3,099 |
Income per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.44 |  |  | $ | 0.39 |  |  | $ | 0.49 |  |  | $ | 0.41 |  |  | $ | 0.54 |  |  | $ | 0.48 |  |  | $ | 0.33 |  |  | $ | 0.33 |
Diluted |  | $ | 0.44 |  |  | $ | 0.39 |  |  | $ | 0.49 |  |  | $ | 0.41 |  |  | $ | 0.54 |  |  | $ | 0.48 |  |  | $ | 0.33 |  |  | $ | 0.33 |

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- 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121640914&loc=d3e1280-108306 + Details
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