Note 22 - Subsequent Event (Details Textual) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions		1 Months Ended	9 Months Ended
	Nov. 07, 2022	Oct. 31, 2022	Sep. 30, 2022	Sep. 30, 2021	Oct. 01, 2022	Dec. 31, 2021
Marketable Securities, Total			$ 999,094			$ 1,211,739
Proceeds from Sale and Maturity of Marketable Securities			$ 800	$ 339
Albertsons Companies, Inc [Member]
Investment Owned, Balance, Shares (in shares)			39.8
Marketable Securities, Total			$ 990,400
Albertsons Companies, Inc [Member] | Forecast [Member]
Investment Owned, Balance, Shares (in shares)					28.3
Marketable Securities, Cash Dividend Receivable, Per Share (in dollars per share)	$ 6.85
Sale of Marketable Securities (in shares)		11.5
Proceeds from Sale and Maturity of Marketable Securities		$ 301,100
Investment Income, Dividend		$ 194,100
Albertsons Companies, Inc [Member] | Forecast [Member] | Certain Contractual Lock-up Provisions That Expire in May 2023 [Member]
Investment Owned, Balance, Shares (in shares)					28.0