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Note 12 - Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Share-Based Payment Arrangement, Option, Activity [Table Text Block] |
|  |  |  |  |  |  |  |  |  | Non-qualified |  |  | Weighted Average |  |  | Aggregate |
|  | 2010 Plan |  |  | 2017 Plan |  |  | Stock Options |  |  | Exercise Price |  |  | Intrinsic Value(1) |
Outstanding as of December 31, 2023 |  |  | 188,500 |  |  |  | 430,000 |  |  |  | — |  |  | $ | 6.82 |  |  | $ | (1,071,121 | )
Grants |  |  | — |  |  |  | 86,000 |  |  |  | — |  |  | $ | 3.91 |  |  |  |  |
Terminations/forfeitures(2) |  |  | (5,000 | ) |  |  | (35,500 | ) |  |  | — |  |  | $ | 6.55 |  |  |  |  |
Exercises |  |  | — |  |  |  | — |  |  |  | — |  |  | $ | — |  |  |  |  |
Outstanding as of December 31, 2024 |  |  | 183,500 |  |  |  | 480,500 |  |  |  | — |  |  | $ | 6.46 |  |  | $ | (870,558 | )
Grants |  |  | — |  |  |  | 132,000 |  |  |  | 75,983 |  |  | $ | 5.67 |  |  |  |  |
Terminations/forfeitures(2) |  |  | (38,000 | ) |  |  | (80,500 | ) |  |  | — |  |  | $ | 6.72 |  |  |  |  |
Exercises |  |  | — |  |  |  | (15,000 | ) |  |  | — |  |  | $ | 4.81 |  |  |  |  |
Outstanding as of September 30, 2025 |  |  | 145,500 |  |  |  | 517,000 |  |  |  | 75,983 |  |  | $ | 6.23 |  |  | $ | 14,200 |
Vested as of September 30, 2025 |  |  | 145,500 |  |  |  | 176,000 |  |  |  | — |  |  | $ | 7.39 |  |  | $ | (365,817 | )
Vested and expected to vest as of September 30, 2025 |  |  | 145,500 |  |  |  | 517,000 |  |  |  | 75,983 |  |  | $ | 6.23 |  |  | $ | 14,200 |
Reserved for future grants |  |  | — |  |  |  | 100,000 |  |  |  | — |  |  |  |  |  |  |  |  |
|  |  |  |  |  | Weighted Average |  |  |  |  |
|  |  |  |  |  | Fair Value at |  |  | Weighted Average |
|  | Number of Shares |  |  | Grant Date |  |  | Exercise Price |
Non-vested stock options outstanding as of September 30, 2025 |  |  | 416,983 |  |  | $ | 2.76 |  |  | $ | 5.34 |
Non-vested stock options outstanding as of December 31, 2024 |  |  | 344,000 |  |  | $ | 3.12 |  |  | $ | 6.25 |
Stock options granted during the nine-month period ended September 30, 2025 |  |  | 207,983 |  |  | $ | 3.02 |  |  | $ | 5.67 |
Stock options that vested during the nine-month period ended September 30, 2025 |  |  | 107,000 |  |  | $ | 4.36 |  |  | $ | 8.07 |
Stock options that were terminated or forfeited during the nine-month period ended September 30, 2025 |  |  | 118,500 |  |  | $ | 3.68 |  |  | $ | 6.72 |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | During the Three-Month |  |  | During the Nine-Month |
|  | Periods Ended September 30, |  |  | Periods Ended September 30, |
|  | 2025 |  |  | 2024 |  |  | 2025 |  |  | 2024 |
Risk-free interest rate(1) |  |  | 3.70 | % |  |  | 3.48 | % |  |  | 3.82 | % |  |  | 3.70 | %
Dividend yield(2) |  |  | 0 | % |  |  | 0 | % |  |  | 0 | % |  |  | 0 | %
Expected volatility(2) |  |  | 55 | % |  |  | 52 | % |  |  | 53 | % |  |  | 51 | %
Expected life in years(3) |  |  | 6.1 |  |  |  | 4.1 |  |  |  | 5.7 |  |  |  | 4.3 |

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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