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Note 4 - Cash, Cash Equivalents and Marketable Securities (10Q) (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Debt Securities, Available-for-Sale, Unrealized Loss Position | $ 1,991,770 |
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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