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Note 5 - Income (Loss) Per Share (Tables) | 6 Months Ended
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Jun. 30, 2017
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | (Unaudited) |  |  | (Unaudited) |
(Amounts in Thousands, Except for Per Share Amounts) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Net loss attributable to Perma-Fix Environmental Services, Inc., common stockholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss from continuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders |  | $ | (1,009 | ) |  | $ | (7,970 | ) |  | $ | (1,605 | ) |  | $ | (11,643 | )
Loss from discontinuing operations attributable to Perma-Fix Environmental Services, Inc. common stockholders |  |  | (160 | ) |  |  | (264 | ) |  |  | (291 | ) |  |  | (431 | )
Net loss attributable to Perma-Fix Environmental Services, Inc. common stockholders |  | $ | (1,169 | ) |  | $ | (8,234 | ) |  | $ | (1,896 | ) |  | $ | (12,074 | )
Basic loss per share attributable to Perma-Fix Environmental Services, Inc. common stockholders |  | $ | (.10 | ) |  | $ | (.71 | ) |  | $ | (.16 | ) |  | $ | (1.04 | )
Diluted loss per share attributable to Perma-Fix Environmental Services, Inc. common stockholders |  | $ | (.10 | ) |  | $ | (.71 | ) |  | $ | (.16 | ) |  | $ | (1.04 | )
Weighted average shares outstanding: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average shares outstanding |  |  | 11,698 |  |  |  | 11,574 |  |  |  | 11,690 |  |  |  | 11,566 |
Add: dilutive effect of stock options |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Add: dilutive effect of warrants |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Diluted weighted average shares outstanding |  |  | 11,698 |  |  |  | 11,574 |  |  |  | 11,690 |  |  |  | 11,566 |
Potential shares excluded from above weighted average share calcualtions due to their anti-dilutive effect include: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upon exercise of options |  |  | 205 |  |  |  | 171 |  |  |  | 205 |  |  |  | 183 |

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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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