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Note 19 - Loss Per Share | 12 Months Ended
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Dec. 31, 2020
Notes to Financial Statements |
Earnings Per Share [Text Block] | 19. Loss Per Share Basic earnings per share is computed by dividing net loss attributable to Yunhong CTI Ltd. Common shareholders by the weighted average number of shares of common stock outstanding during each period. Diluted earnings per share is computed by dividing net loss attributable to Yunhong CTI Ltd. Common shareholders by the weighted average number of shares of common stock and equivalents (stock options and warrants), unless anti-dilutive, during each period.
Consolidated earnings per share |  | 2020 |  |  | 2019 |
Loss from continuing operations |  | $ | (2,507,679 | ) |  | $ | (5,972,363 | )
(Gain)/loss attributable to noncontrolling interest |  |  | (3,423 | ) |  |  | 292,518 |
Deemed dividends on preferred stock and amortization of beneficial conversion feature |  |  | (4,380,292 | ) |  |  |  |
Loss from continuing operations attributable to Yunhong CTI Ltd common shareholders |  | $ | (6,891,394 | ) |  | $ | (5,679,845 | )
Loss from discontinued operations |  | $ | (1,743,182 | ) |  | $ | (2,102,084 | )
(Gain)/loss attributable to noncontrolling interest |  |  | (135,202 | ) |  |  | 1,239,611 |
Loss from discontinued operations attributable to Yunhong CTI Ltd common shareholders |  | $ | (1,878,384 | ) |  | $ | (862,473 | )
Basic and Diluted loss per common share: |  |  |  |  |  |  |  |
Continuing operations |  | $ | (1.46 | ) |  | $ | (1.48 | )
Discontinued operations |  |  | (0.40 | ) |  |  | (0.22 | )
|  | $ | (1.77 | ) |  | $ | (1.70 | )
Basic and Diluted weighted average number of shares and equivalent shares of common stock outstanding |  |  | 4,705,741 |  |  |  | 3,835,950 |

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