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Note 4 - Management Actions (Details Textual) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Charges, Total		$ 3.1	$ 2.0		$ 6.2	$ 6.1
Notes Receivable, Write-down					0.0	2.7	$ 0.0
Employee Severance [Member]
Restructuring Charges, Total		1.4	1.3			4.8
Other Restructuring [Member]
Restructuring Charges, Total		1.7	0.7
Selling, General and Administrative Expenses [Member]
Restructuring Charges, Total		1.9	1.7
Notes Receivable, Write-down				$ 2.7
Selling, General and Administrative Expenses [Member] | Employee Severance [Member]
Restructuring Charges, Total	$ 3.5					4.5
Cost of Sales [Member]
Restructuring Charges, Total		$ 1.2	$ 0.3
Inventory Write-down					$ 1.7	3.3
Cost of Sales [Member] | Employee Severance [Member]
Restructuring Charges, Total						$ 0.3

X

- Definition

The amount of write-down of notes receivable.

+ References

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- Definition

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+ References

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