Consolidated Statements of Stockholders' Equity (Parentheticals) - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Regular dividends per share (in dollars per share)	$ 1	$ 1	$ 1
Extra dividends per share (in dollars per share)	$ 3	$ 3.5	$ 5.25