Note 7 - Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2023 |
Jun. 30, 2022 |
Jun. 30, 2023 |
Jun. 30, 2022 |
Jan. 01, 2023 |
|
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 0 | 912,000 | ||
| 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 | $ 2,074,670 | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 0 | 52,000 | 20,000 | 157,000 | |
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 591,946 | $ 591,946 | |||
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month) | 13 months | ||||
| Share-Based Payment Arrangement, Expense | $ 88,159 | $ 358,936 | $ 376,331 | $ 588,902 | |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| 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
|
| 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.
|