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Quarterly Financial Data - Unaudited | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Data [Abstract] |
Quarterly Financial Data | Quarterly Financial Data (in thousands, except per share data) – Unaudited
2018 |  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total
Total revenue |  | $ | 14,718 |  | $ | 18,204 |  | $ | 16,396 |  | $ | 16,160 |  | $ | 65,478
Operating income (loss) |  | 350 |  | 226 |  | (44) |  | 106 |  | 638
Net income (loss) |  | 225 |  | 247 |  | 236 |  | (282) |  | 426
Net income (loss) per share - Basic |  | 0.02 |  | 0.02 |  | 0.02 |  | (0.02) |  | 0.03
Net income (loss) per share - Diluted |  | 0.02 |  | 0.02 |  | 0.02 |  | (0.02) |  | 0.03
2017 |  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total
Total revenue |  | $ | 18,902 |  | $ | 16,218 |  | $ | 15,913 |  | $ | 16,660 |  | $ | 67,693
Operating income |  | 343 |  | 414 |  | 593 |  | 217 |  | 1,567
Net income (1) |  | 252 |  | 375 |  | 522 |  | 18,702 |  | 19,851
Net income per share - Basic |  | 0.02 |  | 0.03 |  | 0.04 |  | 1.46 |  | 1.55
Net income per share - Diluted |  | 0.02 |  | 0.03 |  | 0.04 |  | 1.42 |  | 1.51
(1) The increase in fourth quarter net income is largely a result of the 2017 Tax Act, see Note 7. Amounts may not add due to rounding differences.

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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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