Note 9 - Fair Value Measurements - Fair Value Assets Measured On Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) |
Jun. 30, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Warrant liability | $ 105,699 | $ 372,730 |
| Total | 105,699 | 372,730 |
| Fair Value, Inputs, Level 3 [Member] | ||
| Warrant liability | 105,699 | 372,730 |
| Total | $ 105,699 | $ 372,730 |