Note 6 - Investments - Investments (Details) - USD ($) $ in Thousands |
Jun. 30, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Schedule of Investments [Line Items] | ||
| Investment, Cost | $ 14,903 | $ 9,991 |
| Investment, Unrealized gain/(loss) | 3 | (2) |
| Investment, Market value | 14,906 | 9,989 |
| United States Treasury Bills [Member] | ||
| Schedule of Investments [Line Items] | ||
| Investment, Cost | 13,122 | 9,991 |
| Investment, Unrealized gain/(loss) | 3 | (2) |
| Investment, Market value | 13,125 | $ 9,989 |
| Commercial Notes [Member] | ||
| Schedule of Investments [Line Items] | ||
| Investment, Cost | 1,781 | |
| Investment, Unrealized gain/(loss) | 0 | |
| Investment, Market value | $ 1,781 |
| X | ||||||||||
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, before tax, of unrealized gain (loss) in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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