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Income (Loss) Per Share (Q1) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2022 | Dec. 31, 2021
Earnings Per Share [Abstract] |  |
Income (Loss) Per Share | Note 4 – Income (Loss) Per Share For the three months ended March 31, 2022 and 2021, the Company incurred net losses and therefore no common stock equivalents were utilized in the calculation of diluted loss per share as they are anti-dilutive. At March 31, 2022 and 2021, the Company excluded the following potentially dilutive securities (in thousands):
| ​ | ​ | March 31,
| ​ | ​ | 2022 | ​ | ​ | 2021
Stock Options | ​ | ​ | 2,640 | ​ | ​ | 1,022
Warrants | ​ | ​ | 21,357 | ​ | ​ | 21,357
Restricted Stock Units | ​ | ​ | 1,460 | ​ | ​ | 798
| Note 5 – Loss Per Share For the years ended December 31, 2021 and 2020, the Company incurred net losses and therefore no common stock equivalents were utilized in the calculation of loss per share as they are anti-dilutive in the periods presented. At December 31, 2021 and 2020, the Company excluded the following potentially dilutive securities (in thousands):
| ​ | ​ | December 31,
| ​ | ​ | 2021 | ​ | ​ | 2020
Stock Options | ​ | ​ | 2,132 | ​ | ​ | 964
Warrants | ​ | ​ | 21,357 | ​ | ​ | 2,638
Restricted Stock Units | ​ | ​ | 604 | ​ | ​ | 340

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