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Note 13 - Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2023
Notes Tables |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
|  | February 16, 2023
|  | Option Award
|  | Modifications
|  | Immediately Before |  | Immediately After
Range of fair values |  | 0.000 -2.1414 |  | 1.322 -2.2424
Range of risk-free interest rates |  | 3.82% - 4.99% |  | 3.82% - 4.99%
Range of remaining contractual terms (in years) |  | 0.37 - 4.25 |  | 3.37 - 7.25
Range of weighted volatilities |  | 66.96% - 103.39% |  | 66.96% - 103.39%
Expected dividend yield |  | 0.00% |  | 0.00%

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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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