Note 4 - Stock-based Compensation - Summary of Unvested Restricted Stock (Details) - Restricted Stock [Member] |
3 Months Ended |
|---|---|
|
Mar. 31, 2022
$ / shares
shares
| |
| Unvested at beginning of period (in shares) | shares | 95,000 |
| Unvested at beginning of period, weighted average grant-date fair value (in dollars per share) | $ / shares | $ 1.40 |
| Vested (in shares) | shares | (2,500) |
| Vested, weighted average grant-date fair value (in dollars per share) | $ / shares | $ 2.28 |
| Unvested at end of period (in shares) | shares | 92,500 |
| Unvested at end of period, weighted average grant-date fair value (in dollars per share) | $ / shares | $ 1.38 |
| X | ||||||||||
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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