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Note 6 - Share-based Compensation - Noncash Stock Option Compensation (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Stock-based compensation | $ 247,390 | $ 281,307 | $ 851,471 | $ 946,262
Share based compensation expense - stock option | 247,390 | 281,307 | 851,471 | 946,262
Share-Based Payment Arrangement, Option [Member] |  |  |  |
Stock-based compensation | 200,387 | 224,749 | 634,194 | 779,663
Share based compensation expense - stock option | 200,387 | 224,749 | 634,194 | 779,663
Restricted Stock Units (RSUs) [Member] |  |  |  |
Stock-based compensation | 47,003 | 56,558 | 217,277 | 166,599
Share based compensation expense - stock option | 47,003 | 56,558 | 217,277 | 166,599
General and Administrative Expense [Member] |  |  |  |
Stock-based compensation | (235,024) | (270,672) | (814,430) | (913,804)
Share based compensation expense - stock option | (235,024) | (270,672) | (814,430) | (913,804)
Research and Development Expense [Member] |  |  |  |
Stock-based compensation | 12,366 | 10,635 | 37,041 | 32,458
Share based compensation expense - stock option | $ 12,366 | $ 10,635 | $ 37,041 | $ 32,458

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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