Note 9 - Stock Compensation - Granted Awards Activity (Details) shares in Millions	3 Months Ended
	Mar. 31, 2021 $ / shares shares
Restricted Stock Units (RSUs) [Member]
Granted (in shares) | shares	0.8
Grant Date Fair Value (in dollars per share) | $ / shares	$ 23.43	[1]
Performance Share Units [Member]
Granted (in shares) | shares	0.2
Grant Date Fair Value (in dollars per share) | $ / shares	$ 26.81	[1]

[1] Weighted-average per share