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Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Data [Abstract] |
Quarterly Financial Data | Quarterly Financial Data (in thousands, except per share data) – Unaudited
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.
2016 |  | Q1 |  | Q2 |  | Q3 |  | Q4 |  | Total
Total revenue |  | $ | 21,576 |  |  | $ | 17,194 |  |  | $ | 16,181 |  |  | $ | 16,703 |  |  | $ | 71,654 |
Operating income |  | 3,767 |  |  | 1,873 |  |  | 1,823 |  |  | 967 |  |  | 8,430 |
Net income |  | 2,541 |  |  | 1,259 |  |  | 1,509 |  |  | 1,160 |  |  | 6,469 |
Net income per share - Basic |  | 0.20 |  |  | 0.10 |  |  | 0.12 |  |  | 0.09 |  |  | 0.51 |
Net income per share - Diluted |  | 0.20 |  |  | 0.10 |  |  | 0.12 |  |  | 0.09 |  |  | 0.50 |
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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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