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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 |

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- 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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