Note 7 - Investments (Details Textual) |
12 Months Ended |
|---|---|
Dec. 31, 2022 | |
| U.S. Treasury Bills [Member] | Maximum [Member] | |
| Schedule of Investments [Line Items] | |
| Short-term investments, maturity period | 1 year |
| X | ||||||||||
- Definition Short-term investments maturity period. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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