Note 8 - Stockholders' Equity - Stock Option Activity (Details) - shares |
6 Months Ended | 12 Months Ended | |||||
|---|---|---|---|---|---|---|---|
May 16, 2022 |
Mar. 29, 2022 |
Aug. 11, 2021 |
May 02, 2021 |
Mar. 26, 2021 |
Jun. 30, 2022 |
Dec. 31, 2021 |
|
| Outstanding at December 31, 2020 (in shares) | 6,246,466 | 6,007,552 | |||||
| Granted (in shares) | 45,000 | 150,000 | 5,000 | 20,000 | 67,500 | 195,000 | 637,500 |
| Forfeited/canceled (in shares) | (224,375) | (272,029) | |||||
| Expired (in shares) | (10,250) | (126,557) | |||||
| Outstanding at December 31, 2021 (in shares) | 6,206,841 | 6,246,466 |
| X | ||||||||||
- Definition Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Gross number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|