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Note 4 - Management Actions (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Restructuring Charges, Total |  |  | $ 3.1 | $ 2.0 | $ 0.9 | $ 6.2
Employee Severance [Member] |  |  |  |  |  |
Restructuring Charges, Total |  |  | 1.4 | 1.3 |  |
Other Restructuring [Member] |  |  |  |  |  |
Restructuring Charges, Total |  |  | 1.7 | 0.7 |  |
Selling, General and Administrative Expenses [Member] |  |  |  |  |  |
Restructuring Charges, Total |  |  | 1.9 |  |  |
Selling, General and Administrative Expenses [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Charges, Total | $ 0.9 | $ 3.5 |  | 1.7 |  |
Cost of Sales [Member] |  |  |  |  |  |
Restructuring Charges, Total |  |  | $ 1.2 |  |  |
Inventory Write-down |  |  |  | 1.7 |  |
Cost of Sales [Member] | Employee Severance [Member] |  |  |  |  |  |
Restructuring Charges, Total |  |  |  | $ 0.3 |  |

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