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Note 9 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Unrestricted investments available for sale, equity, amortized cost $ 24,734 $ 24,734
Marketable equity securities 166,754 140,064
Restricted marketable equity securities 17,482 23,190
Unrestricted investments available for sale, debt, amortized cost 124,021 125,118
Unrestricted investments available for sale, debt, fair value 122,912 119,804
Investments available for sale, amortized cost 166,964 173,828
Marketable Securities 307,148 283,058
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 166,754 140,064
Restricted investments available for sale, equity, amortized cost 12,767 18,534
Restricted marketable equity securities 17,482 23,190
Corporate Debt Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 62,677 58,927
Unrestricted investments available for sale, debt, fair value 63,095 57,471
Restricted investments available for sale, debt, amortized cost 13,759 15,593
Restricted investments available for sale, debt, fair value 12,942 14,410
US Government Corporations and Agencies Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 44,470 46,811
Unrestricted investments available for sale, debt, fair value 43,771 44,186
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 3,115 3,787
Restricted investments available for sale, debt, fair value $ 3,104 $ 3,737