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Note 19 - Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Notes Tables |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] |
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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