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Note 6 - Marketable Securities (Details Textual) - USD ($)
$ in Thousands, shares in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Proceeds from Sale and Maturity of Marketable Securities $ 291,341 $ 800  
Marketable Securities 327,135   $ 597,732
Dividend Income, Equity Securities, Operating $ 194,100    
Albertsons Companies, Inc [Member]      
Sale of Marketable Securities (in shares) 14.1    
Proceeds from Sale and Maturity of Marketable Securities $ 282,300    
Equity Securities, FV-NI, Realized Gain (Loss) 241,200    
Equity Securities, Federal and State Taxes Payable on Capital Gains $ 61,000    
Investment Owned, Balance, Shares (in shares) 14.2    
Marketable Securities $ 323,300