Note 1 - Basis of Presentation - Reconciliation of Basic to Diluted Weighted-average Shares Outstanding (Details) - shares shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Weighted-average shares outstanding-basic (in shares)	97	100	98	100
Common stock equivalents for stock options and restricted shares (in shares)	0	1	0	0
Weighted-average shares outstanding-diluted (in shares)	97	101	98	100