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Note 9 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Unrestricted investments available for sale, equity, amortized cost $ 24,734 $ 24,734
Marketable equity securities 123,040 111,117
Unrestricted investments available for sale, debt, amortized cost 132,410 135,338
Unrestricted investments available for sale, debt, fair value 124,316 127,727
Restricted marketable equity securities 29,616 26,779
Investments available for sale, amortized cost 187,081 189,648
Marketable Securities 276,972 265,623
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 123,040 111,117
Restricted investments available for sale, equity, amortized cost 24,495 24,134
Restricted marketable equity securities 29,616 26,779
Corporate Debt Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 494 2,497
Unrestricted investments available for sale, debt, fair value 484 2,441
Restricted investments available for sale, debt, amortized cost 61,488 59,586
Restricted investments available for sale, debt, fair value 59,398 57,731
US Government Corporations and Agencies Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 0 2,990
Unrestricted investments available for sale, debt, fair value 0 2,986
Restricted investments available for sale, debt, amortized cost 47,323 46,771
Restricted investments available for sale, debt, fair value 43,004 42,863
Asset-Backed Securities [Member]    
Restricted investments available for sale, debt, amortized cost 19,026 19,388
Restricted investments available for sale, debt, fair value 17,438 17,659
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 4,079 4,106
Restricted investments available for sale, debt, fair value $ 3,992 $ 4,047