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Note 4 - Cash, Cash Equivalents and Marketable Securities (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-Sale, Total | $ 2,991,770 | $ 12,408,940 | $ 0
Marketable Securities, Unrealized Gain (Loss), Excluding Other-than-temporary Impairment Loss |  | (35,638) |
Marketable Securities, Other-than-temporary Impairment Loss |  | 0 |
Marketable Securities, Realized Gain (Loss), Excluding Other-than-temporary Impairment Loss |  | $ 0 |
Minimum [Member] |  |  |
Marketable Securities Contractual Maturity (Month) | 7 months | 3 months |
Maximum [Member] |  |  |
Marketable Securities Contractual Maturity (Month) | 30 months | 12 months |

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