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Net Income per Common Share (Tables) | 9 Months Ended
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Sep. 30, 2018
Earnings Per Share [Abstract] |
Computation of basic and diluted net income per common share: | The computation of basic and diluted net income per common share is as follows:
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income (loss) | $ | (1,803,000 | ) |  | $ | 855,000 |  |  | $ | (839,000 | ) |  | $ | 4,704,000 |
Weighted average common shares outstanding — basic | 7,804,000 |  |  | 7,711,000 |  |  | 7,758,000 |  |  | 7,683,000 |
Effect of dilutive securities | — |  |  | 46,000 |  |  | — |  |  | 56,000 |
Weighted average common and potentially issuable common shares outstanding — diluted | 7,804,000 |  |  | 7,757,000 |  |  | 7,758,000 |  |  | 7,739,000 |
Basic net income (loss) per common share | $ | (0.23 | ) |  | $ | 0.11 |  |  | $ | (0.11 | ) |  | $ | 0.61 |
Diluted net income (loss) per common share | $ | (0.23 | ) |  | $ | 0.11 |  |  | $ | (0.11 | ) |  | $ | 0.61 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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