Note 7 - Stockholders' Equity (Tables)
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12 Months Ended |
Dec. 31, 2021 |
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| Notes Tables |
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| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | 2021 | | | 2020 | | | Weighted average risk-free interest rates | | | 1.43 | % | | | 0.69 | % | | Expected dividend yield | | | 0.0 | % | | | 0.0 | % | | Expected life of option (in years) | | | 7.0 | | | | 7.0 | | | Expected volatility | | | 84.80 | % | | | 38.16 | % | |
| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
| | | Number of Shares | | | Weighted- Average Exercise Price | | | Weighted- Average Remaining Contractual Term (yrs) | | | Aggregate Intrinsic Value | | | Outstanding at December 31, 2020 | | | 602,000 | | | $ | 2.79 | | | | | | | | | | | Granted | | | 360,300 | | | | 3.82 | | | | | | | | | | | Exercised | | | - | | | | - | | | | | | | | | | | Forfeited or expired | | | - | | | | - | | | | | | | | | | | Outstanding at December 31, 2021 | | | 962,300 | | | $ | 3.18 | | | | 9.31 | | | $ | 499,660 | | | Exercisable at December 31, 2021 | | | 200,661 | | | $ | 2.79 | | | | 8.93 | | | $ | 166,549 | | |
| Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block] |
| Warrant Description | | Number of Shares | | | Exercise Price | | Expiration | | 2020 Warrants | | | 120,000 | | | | 5.00 | | | | 2020 Unit Warrants | | | 2,396,631 | | | | 5.00 | | | | 2020 Representative Warrants | | | 128,000 | | | | 5.50 | | | | 2021 Representative Warrants | | | 72,000 | | | | 6.875 | | | | 2021 Warrants | | | 100,000 | | | | 13.00 | | | | Total Warrants Outstanding at December 31, 2021 | | | 2,816,631 | | | | | | | | | | | | | | | | | | | Weighted-Average Exercise Price | | $ | 5.35 | | | | | | | | Weighted-Average Remaining Life (in years) | | | 3.7 | | | | | | | |