Note 7 - Stock Option Plan and Stock-based Compensation (Details Textual) - USD ($) |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Share-based Payment Arrangement, Expense | $ 39,876 | $ 17,089 | $ 79,562 | $ 106,713 | $ 0 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total | $ 201,835 | $ 201,835 | $ 281,397 | $ 0 | |
| Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) | 1 year 8 months 12 days | ||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 0 | 127,427 | 0 | ||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares) | 0 | ||||
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) | 0 | 47,461 | |||