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Summary Selected Quarterly Financial Data (unaudited) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Summary Selected Quarterly Financial Data (Unaudited) | Note 14 - Summary Selected Quarterly Financial Data (unaudited) The following is a summary of selected unaudited consolidated quarterly financial data for the years ended December 31, 2018 and 2017 (in thousands, except per share data):
|  | Three Months Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 2018 |  |  | 2018 |  |  | 2018 |  |  | 2018 |
Total revenues |  | $ | 77,749 |  |  | $ | 96,353 |  |  | $ | 84,890 |  |  | $ | 98,583 |
Income (loss) from operations |  | $ | (2,288 | ) |  | $ | 11,027 |  |  | $ | 4,942 |  |  | $ | 8,744 |
Net income (loss) |  | $ | (1,733 | ) |  | $ | 7,788 |  |  | $ | 3,950 |  |  | $ | 5,375 |
Basic income (loss) per common share |  | $ | (0.10 | ) |  | $ | 0.43 |  |  | $ | 0.22 |  |  | $ | 0.29 |
Diluted income (loss) per common share |  | $ | (0.10 | ) |  | $ | 0.43 |  |  | $ | 0.21 |  |  | $ | 0.29 |
|  | Three Months Ended |
|  | March 31, |  |  | June 30, |  |  | September 30, |  |  | December 31, |
|  | 2017 |  |  | 2017 |  |  | 2017 |  |  | 2017 |
Total revenues |  | $ | 77,194 |  |  | $ | 89,733 |  |  | $ | 80,369 |  |  | $ | 90,377 |
Income from operations |  | $ | 3,136 |  |  | $ | 10,213 |  |  | $ | 6,749 |  |  | $ | 7,451 |
Net income |  | $ | 3,030 |  |  | $ | 6,064 |  |  | $ | 3,953 |  |  | $ | 2,093 |
Basic income per common share |  | $ | 0.17 |  |  | $ | 0.34 |  |  | $ | 0.22 |  |  | $ | 0.12 |
Diluted income per common share |  | $ | 0.16 |  |  | $ | 0.34 |  |  | $ | 0.22 |  |  | $ | 0.11 |
Out of Period Adjustment During the quarter ended June 30, 2018, the Company recorded $1.0 million of revenue ($0.7 million after tax) for an out-of-period correction within research services in the Consolidated Statements of Income. The error resulted from an understatement of revenue from the reprint product line of $0.8 million ($0.5 million after tax) during the three months ended March 31, 2018 and $0.2 million ($0.1 million after tax) from the year ended December 31, 2017. The Company has concluded that the error was not material to all annual financial statement periods presented.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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