Note 8 - Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2022 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2021 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 265,000 | 30,000 | 1,177,000 | 302,500 |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Fair Value | $ 157,300 | $ 34,500 | $ 2,231,970 | $ 363,550 |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 107,000 | 65,000 | 264,000 | 450,000 |
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 2,019,066 | $ 2,019,066 | ||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) | 9 months 12 days | |||
| Share-Based Payment Arrangement, Expense | $ 614,094 | $ 80,882 | $ 1,455,835 | $ 220,455 |
| X | ||||||||||
- Definition The grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. No definition available.
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| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. 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 share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|