Note 3 - Investments - Schedule of Investments (Details) - USD ($) |
Jun. 30, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Investments, cost basis | $ 9,082,074 | $ 12,167,457 |
| Investments, unrealized gains | 28,503 | 15,039 |
| Investments, aggregate fair value | 9,110,577 | 12,182,496 |
| US Treasury Bill Securities [Member] | ||
| Investments, cost basis | 4,936,367 | 6,905,171 |
| Investments, unrealized gains | 28,503 | 15,039 |
| Investments, aggregate fair value | 4,964,870 | 6,920,210 |
| Money Market Funds [Member] | ||
| Investments, cost basis | 4,145,707 | 5,262,286 |
| Investments, unrealized gains | 0 | 0 |
| Investments, aggregate fair value | $ 4,145,707 | $ 5,262,286 |
| X | ||||||||||
- Definition Amount, before tax, of unrealized gain 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/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| 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), classified as current. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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