Note 7 - Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
Sep. 30, 2023 |
Jun. 30, 2023 |
Sep. 30, 2022 |
Sep. 30, 2023 |
Sep. 30, 2022 |
Jan. 01, 2023 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 53,500 | 131,200 | |||
| Percentage of Size Adjustment Premium of Volatility, Increased During Period | 30.00% | |||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Grant Date Fair Value | $ 168,900 | $ 1,639,870 | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 0 | 10,700 | 2,000 | 26,400 | ||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 431,067 | $ 431,067 | ||||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) | 11 months | |||||
| Share-Based Payment Arrangement, Expense | $ 180,816 | $ 398,319 | $ 557,146 | $ 971,777 | ||
| 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
|
| X | ||||||||||
- Definition Number of share options (or share units) exercised during the current period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Represents percentage of size adjustment premium of volatility increased during period. No definition available.
|
| 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.
|