Note 5 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2023 USD ($) $ / shares shares	Mar. 31, 2022 USD ($) $ / shares	Dec. 31, 2022 shares
Capital Units, Authorized (in shares)			245,000,000
Common Stock, Shares Authorized (in shares)			200,000,000
Preferred Stock, Shares Authorized (in shares)			20,000,000
Common Stock, Voting Rights, Votes Per Share			1
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.08	$ 0.08
Dividends, Common Stock | $	$ 7	$ 8
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	8,900,000		10,000,000.0
Treasury Stock, Shares, Acquired (in shares)	0
Class A Common Stock (No Par Value) [Member]
Common Stock, Shares Authorized (in shares)	25,000,000		25,000,000
Common Stock, Voting Rights, Votes Per Share			10
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	2,800,000		2,800,000
Common Stock and Class A Common Stock [Member]
Stock Repurchase Program, Authorized Amount | $	$ 124