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Note 4 - Cash, Cash Equivalents and Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Cash and Cash Equivalents [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Cash in banking institutions |  | $ | 1,586,920 |  |  | $ | 30,308,075 |
Money market funds |  |  | 8,526,786 |  |  |  | 7,005,483 |
Total |  | $ | 10,113,706 |  |  | $ | 37,313,558 |
Debt Securities, Available-for-Sale [Table Text Block] |
|  | Amortized cost |  |  | Unrealized gains |  |  | Unrealized losses |  |  | Fair Value |
Commercial paper |  | $ | 9,445,220 |  |  | $ | 263 |  |  | $ | (21,313 | ) |  | $ | 9,424,170 |
U.S. treasury bonds |  |  | 2,999,095 |  |  |  | — |  |  |  | (14,325 | ) |  |  | 2,984,770 |
Total |  | $ | 12,444,315 |  |  | $ | 263 |  |  | $ | (35,638 | ) |  | $ | 12,408,940 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI https://asc.fasb.org/topic&trid=2196928 + Details
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