Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Net number of share options (or share units) granted during the period.

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Note 10 - Stock-based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Oct. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares)	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)			1,252,621	1,274,182	547,244
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number (in shares)	1,230,033	1,230,033			547,244
Share-based Payment Arrangement, Option [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 0.1	$ 0.1
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		7 months 6 days
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche A [Member] \| Minimum [Member] \| Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		20.00%
Share-based Payment Arrangement, Option [Member] \| Share-based Payment Arrangement, Tranche A [Member] \| Maximum [Member] \| Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		5 years
Restricted Stock Units (RSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	11.2	$ 11.2
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		1 year 2 months 12 days
Phantom Share Units (PSUs) [Member]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total	$ 13.9	$ 13.9
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)		4 years 8 months 12 days
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Phantom Share Units (PSUs) [Member] \| On Each of First Four Anniversaries of Date of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Performance Shares [Member] \| Share-based Payment Arrangement, Tranche A [Member] \| Minimum [Member] \| Long-term Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)		4 years
Restricted Stock [Member] \| On Each of First Four Anniversaries of Date of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%