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Quarterly Financial Information (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Information (unaudited) | The following table reflects the quarterly results of operations for the years ended December 31, 2016 and 2015 (dollars in thousands).
|  | Quarter ended
|  | December 31, 2016 |  | September 30, 2016 |  | June 30, 2016 |  | March 31, 2016
Operating revenues |  | $ | 22,009 |  |  | $ | 21,589 |  |  | $ | 21,247 |  |  | $ | 21,527 |
Operating expenses |  | (13,733 | ) |  | (15,172 | ) |  | (13,433 | ) |  | (13,257 | )
Other expense |  | (5,981 | ) |  | (6,490 | ) |  | (6,931 | ) |  | (7,417 | )
Net income (loss) |  | 2,295 |  |  | (73 | ) |  | 883 |  |  | 853 |
Dividends attributable to preferred and senior common stock |  | (2,607 | ) |  | (2,256 | ) |  | (1,514 | ) |  | (1,279 | )
Net loss attributable to common stockholders |  | (312 | ) |  | (2,329 | ) |  | (631 | ) |  | (426 | )
Net loss attributable to common stockholders - basic & diluted |  | $ | (0.01 | ) |  | $ | (0.10 | ) |  | $ | (0.03 | ) |  | $ | (0.02 | )
|  | Quarter ended
|  | December 31, 2015 |  | September 30, 2015 |  | June 30, 2015 |  | March 31, 2015
Operating revenues |  | $ | 21,823 |  |  | $ | 21,375 |  |  | $ | 20,688 |  |  | $ | 19,880 |
Operating expenses |  | (12,970 | ) |  | (13,643 | ) |  | (12,595 | ) |  | (11,757 | )
Other expense |  | (6,286 | ) |  | (7,828 | ) |  | (7,662 | ) |  | (7,429 | )
Net income (loss) |  | 2,567 |  |  | (96 | ) |  | 431 |  |  | 694 |
Dividends attributable to preferred and senior common stock |  | (1,284 | ) |  | (1,286 | ) |  | (1,284 | ) |  | (1,247 | )
Net income (loss) available (attributable) to common stockholders |  | 1,283 |  |  | (1,382 | ) |  | (853 | ) |  | (553 | )
Net income (loss) available (attributable) to common stockholders - basic & diluted |  | $ | 0.06 |  |  | $ | (0.06 | ) |  | $ | (0.04 | ) |  | $ | (0.03 | )

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and 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=51825399&loc=d3e1280-108306 + Details
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