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Selected Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Information [Abstract] |
Summary of Quarterly Financial Information | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended
﻿ |  | March 31, |  | June 30, |  | September 30, |  | December 31,
﻿ |  | (in thousands of dollars except per share information)
﻿2017: |  |  |  |  |  |  |  |  |  |  |  |
﻿Total revenues |  | $ | 21,266 |  | $ | 20,425 |  | $ | 18,178 |  | $ | 17,156
﻿Total operating costs and expenses |  |  | 13,055 |  |  | 15,068 |  |  | 14,454 |  |  | 14,413
﻿Operating income (loss) |  |  | 8,148 |  |  | 5,587 |  |  | 3,721 |  |  | 2,495
﻿Income (loss) from continuing operations |  |  | 4,435 |  |  | 2,451 |  |  | (148) |  |  | 3,534
﻿Loss from discontinued operations |  |  | (176) |  |  | (168) |  |  | (174) |  |  | (103)
﻿Net income (loss) |  |  | 4,259 |  |  | 2,283 |  |  | (322) |  |  | 3,431
﻿Basis net income (loss) per share |  | $ | 0.07 |  | $ | 0.04 |  | $ | (0.01) |  | $ | 0.06
﻿Diluted net income (loss) per share |  | $ | 0.07 |  | $ | 0.04 |  | $ | (0.01) |  | $ | 0.06
﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | Three Months Ended
﻿ |  | March 31, |  | June 30, |  | September 30, |  | December 31,
﻿ |  | (in thousands of dollars except per share information)
﻿2016: |  |  |  |  |  |  |  |  |  |  |  |
﻿Total revenues |  | $ | 10,976 |  | $ | 18,847 |  | $ | 14,635 |  | $ | 15,326
﻿Total operating costs and expenses |  |  | 24,509 |  |  | 14,232 |  |  | 10,919 |  |  | 14,249
﻿Operating income (loss) |  |  | (13,515) |  |  | 4,615 |  |  | 3,690 |  |  | 819
﻿Income (loss) from continuing operations |  |  | (15,430) |  |  | (498) |  |  | 1,016 |  |  | (3,355)
﻿Loss from discontinued operations |  |  | 7,806 |  |  | (20) |  |  | (15,783) |  |  | (286)
﻿Net income (loss) |  |  | (7,624) |  |  | (518) |  |  | (14,767) |  |  | (3,641)
﻿Basis net income (loss) per share |  | $ | (0.13) |  | $ | (0.01) |  | $ | (0.25) |  | $ | (0.06)
﻿Diluted net income (loss) per share |  | $ | (0.13) |  | $ | (0.01) |  | $ | (0.25) |  | $ | (0.06)
﻿

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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/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=84173487&loc=d3e1280-108306 + Details
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