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Note 13 - Warrants and Derivative Liabilities - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details) $ in Millions | Dec. 31, 2020 USD ($) | Oct. 01, 2020 USD ($)
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Fair value | $ 6.7 | $ 4.0
Measurement Input, Revenue Risk Premium [Member] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.069 | 0.071
Measurement Input, Revenue Volatility [Member] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 0.3 | 0.3
Measurement Input, Share Price [Member] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 23.42 | 14.23
Measurement Input, Payment Delay [Member] |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 80 |

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