Note 6 - Stockholders' Equity (Details Textual) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) $ / shares shares	Mar. 31, 2025 USD ($) $ / shares	Dec. 31, 2025 shares
Capital Units, Authorized	245,000,000
Common Stock, Shares Authorized	200,000,000		200,000,000
Preferred Stock, Shares Authorized	20,000,000
Common Stock, Voting Rights, Votes Per Share	1
Common Stock, Dividends, Per Share, Declared | $ / shares	$ 0.08	$ 0.08
Payments of Ordinary Dividends, Common Stock | $	$ 9	$ 8
Common Stock, Capital Shares Reserved for Future Issuance	15,800,000		17,000,000
Class A Common Stock (No Par Value) [Member]
Common Stock, Shares Authorized	25,000,000		25,000,000
Common Stock, Voting Rights, Votes Per Share	10
Common Stock, Capital Shares Reserved for Future Issuance	2,600,000		3,400,000