Note 3 - Investments (Details Textual) - USD ($) |
6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Jun. 30, 2023 |
Dec. 31, 2022 |
||||
| Debt Securities, Available-for-Sale, Unrealized Gain (Loss) | $ 0 | $ 0 | |||
| Investments | 2,976,649 | 4,933,550 | [1] | ||
| Payments to Acquire Debt Securities, Available-for-Sale | 0 | ||||
| US Treasury Bill Securities [Member] | |||||
| Investments | $ 3,000,000.0 | $ 4,900,000 | |||
| |||||
| X | ||||||||||
- Definition Amount of unrealized gain (loss) 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
|
| X | ||||||||||
- Definition Sum of the carrying amounts as of the balance sheet date of all investments. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount of cash outflow to acquire 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
|
| X | ||||||||||
- Details
|