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Nature of Business and Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Reconciliation of Cash, Cash Equivalents and Restricted Cash Reported within Consolidated Statements of Cash Flows | The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the Consolidated Statements of Cash Flows.
|  | December 31, |
|  | 2021 |  |  | 2020 |
Cash and cash equivalents |  | $ | 29,902 |  |  | $ | 35,992 |
Restricted cash |  |  | 2,093 |  |  | $ | 1,819 |
Total cash, cash equivalents and restricted cash |  | $ | 31,995 |  |  | $ | 37,811 |
Schedule of Numerators and Denominators Used to Calculate Basic and Diluted Earnings Per Share | Earnings per share—The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share for 2021, 2020 and 2019.
|  | For the Year Ended December 31 |
|  | 2021 |  |  | 2020 |  |  | 2019 |
(table only in thousands) |  |  |  |  |  |  |  |  |
Numerator (for basic and diluted earnings per share) |  |  |  |  |  |  |  |  |
Net income attributable to CECO Environmental Corp. |  | $ | 1,426 |  |  | $ | 8,211 |  |  | $ | 17,707 |
Denominator |  |  |  |  |  |  |  |  |
Basic weighted-average shares outstanding |  |  | 35,346 |  |  |  | 35,290 |  |  |  | 34,988 |
Common stock equivalents arising from stock options and restricted stock awards |  |  | 249 |  |  |  | 231 |  |  |  | 496 |
Diluted weighted-average shares outstanding |  |  | 35,595 |  |  |  | 35,521 |  |  |  | 35,484 |

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