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Note 12 - Fair Value Measurements (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Payment for Contingent Consideration Liability, Financing Activities | $ 2.5 | $ (0.0) | $ (0.0)
Debt Instrument, Fair Value Disclosure, Total | 271.2 |  |
Debt and Lease Obligation, Total | 267.6 | $ 308.5 |
Gaomei [Member] |  |  |
Payment for Contingent Consideration Liability, Financing Activities | $ 2.5 |  |

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