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Per Share Amounts (Tables) | 6 Months Ended
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Jun. 30, 2020
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | The following table sets forth the computation of basic and diluted earnings per share for the three and six-month periods ended June 30, 2020 and 2019:
|  | Three Months ended June 30, |  |  |  | Six Months ended June 30, |  |
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Net (loss) income attributable to American Shared Hospital Services |  | $ | (483,000) |  |  | $ | 31,000 |  |  | $ | (618,000) |  |  | $ | 301,000 |
Weighted average common shares for basic earnings per share |  | 6,008,000 |  |  | 5,876,000 |  |  | 6,066,000 |  |  | 5,862,000 |
Diluted effect of stock options and restricted stock awards |  | 69,000 |  |  | 30,000 |  |  | 69,000 |  |  | 33,000 |
Weighted average common shares for diluted earnings per share |  | 6,077,000 |  |  | 5,906,000 |  |  | 6,135,000 |  |  | 5,895,000 |
Basic (loss) earnings per share |  | $ | (0.08) |  |  | $ | 0.01 |  |  | $ | (0.10) |  |  | $ | 0.05 |
Diluted (loss) earnings per share |  | $ | (0.08) |  |  | $ | 0.01 |  |  | $ | (0.10) |  |  | $ | 0.05 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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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