Note 1 - Basis of Presentation - Reconciliation of Basic to Diluted Weighted-average Shares Outstanding (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted-average shares outstanding-basic (in shares)	95	100	97	100
Common stock equivalents for stock options and restricted stock (in shares)	1	1	0	0
Weighted-average shares outstanding-diluted (in shares)	96	101	97	100