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Note 13 - Contingent Consideration - Summary of the Key Assumptions Used to Calculate Fair Value of Warrants (Details) $ in Millions | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
--- | --- | --- | --- | --- | --- | ---
Fair value (millions) | $ 1.4 | $ 1.2 | $ 2.6 | $ 4.7 | $ 7.2 | $ 7.1
Measurement Input, Revenue Risk Premium [Member] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 6.60 | 6.50 | 6.60 | 6.60 | 6.60 | 6.70
Measurement Input, Revenue Volatility [Member] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 30 | 33 | 33 | 30 | 30 | 30
Measurement Input, Share Price [Member] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 5.18 | 7.61 | 10.88 | 14.58 | 17.39 | 18.96
Measurement Input, Payment Delay [Member] |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Measurement Input | 80 | 80 | 80 | 80 | 80 | 80

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