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Per Share Amounts (Tables) | 9 Months Ended
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Sep. 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 nine-month periods ended September 30, 2020 and 2019:
|  | Three Months ended September 30, |  | Nine Months ended September 30,
|  | 2020 |  | 2019 |  | 2020 |  | 2019
Net (loss) income attributable to American Shared Hospital Services |  | $ | (209,000) |  |  | $ | 165,000 |  |  | $ | (827,000) |  |  | $ | 466,000 |
Weighted average common shares for basic earnings per share |  | 6,049,000 |  |  | 5,889,000 |  |  | 6,060,000 |  |  | 5,899,000 |
Diluted effect of stock options and restricted stock awards |  | — |  |  | 19,000 |  |  | — |  |  | 18,000 |
Weighted average common shares for diluted earnings per share |  | 6,049,000 |  |  | 5,908,000 |  |  | 6,060,000 |  |  | 5,917,000 |
Basic (loss) earnings per share |  | $ | (0.03) |  |  | $ | 0.03 |  |  | $ | (0.14) |  |  | $ | 0.08 |
Diluted (loss) earnings per share |  | $ | (0.03) |  |  | $ | 0.03 |  |  | $ | (0.14) |  |  | $ | 0.08 |

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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