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Note 6 - Convertible Senior Notes - Schedule of Long-term Debt (Details) (Parentheticals) | Jun. 30, 2023 | Mar. 31, 2023
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March 2023 Note [Member] | Convertible Senior Notes [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.00% | [1] | 3.00%
[1] | The carrying amounts presented are net of unamortized debt issuance costs of $10,618 as of June 30, 2023.

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