Note 9 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Oct. 31, 2023
Dividends Payable, Current	$ 59,800	$ 47,900
Accrued Dividend Equivalents	$ 5,800	$ 11,900
Stock Repurchased and Retired During Period, Shares (in shares)	1,000,000	7,000
Stock Repurchased and Retired During Period, Value, Net Excise Tax	$ 636,200
Stock Repurchased and Retired During Period, Value	$ 637,478	$ 3,741
Maximum [Member]
Stock Repurchase Program, Authorized Amount			$ 640,000