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Note 23 - Lattice-based Valuation of Option Grants (Details) - $ / shares |  | 12 Months Ended
--- | --- | ---
Jul. 27, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Weighted-average fair value of options granted |  | $ 1.50 | $ 1.73
Weighted-average volatility |  | 98.00% | 90.00%
Weighted-average expected dividend yield |  | 0.00% | 0.00%
Lattice Based Valuation | Stock Option [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Weighted-average fair value of options granted | $ 6.57 |  |
Range of risk-free interest rates | 0.11% |  |
Range of risk-free interest rates | 0.30% |  |
Weighted-average term | 5 years 6 months 25 days |  |
Weighted-average volatility | 98.00% |  |
Weighted-average expected dividend yield | 0.00% |  |

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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The maximum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition The minimum risk-free interest rate assumption that is used in valuing an option on its own shares. + References No definition available. + Details
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- Definition Rate of weighted-average expected volatility for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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