Note 5 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions			3 Months Ended
	Mar. 15, 2024 $ / shares	Mar. 15, 2023 $ / shares	Mar. 31, 2024 USD ($) $ / shares shares	Mar. 31, 2023 USD ($) $ / shares	Dec. 31, 2023 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	$ 0.08	$ 0.08
Dividends, Common Stock | $			$ 8	$ 7
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			4,000,000		5,000,000
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, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.08	$ 0.08
Common Stock, Capital Shares Reserved for Future Issuance (in shares)			1,000,000		2,000,000