Note 7 - Marketable Securities (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Proceeds from Sale and Maturity of Marketable Securities	$ 299,634	$ 138,207
Dividend Income, Equity Securities, Operating		$ 194,100
Marketable Securities, Cash Dividend Receivable, Per Share (in dollars per share)		$ 0.09
Albertsons Companies, Inc [Member]
Sale of Marketable Securities (in shares)	14.2	7.1
Proceeds from Sale and Maturity of Marketable Securities	$ 299,100	$ 137,400
Equity Securities, FV-NI, Realized Gain (Loss)	288,700	115,400
Equity Securities, Taxes Paid on Capital Gains	$ 72,900	$ 30,000