Note 5 - Loss Per Share - Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Details) - shares |
3 Months Ended | 6 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|---|
Jun. 30, 2022 |
Jun. 30, 2021 |
Jun. 30, 2022 |
Jun. 30, 2021 |
Dec. 31, 2021 |
Dec. 31, 2020 |
|
| Antidilutive securities (in shares) | 15,076,630 | 15,030,430 | 15,076,630 | 15,030,430 | ||
| Share-Based Payment Arrangement, Option [Member] | ||||||
| Antidilutive securities (in shares) | 192,898 | 146,698 | 192,898 | 146,698 | 192,898 | 65,471 |
| Warrant [Member] | ||||||
| Antidilutive securities (in shares) | 13,883,732 | 13,883,732 | 13,883,732 | 13,883,732 | 13,883,732 | 7,007,581 |
| Earn-out Shares [Member] | ||||||
| Antidilutive securities (in shares) | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | 1,000,000 | |