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Note 9 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Unrestricted investments available for sale, equity, amortized cost $ 24,734 $ 24,734
Marketable equity securities 146,636 140,064
Restricted marketable equity securities 16,269 23,190
Unrestricted investments available for sale, debt, amortized cost 135,689 125,118
Unrestricted investments available for sale, debt, fair value 133,701 119,804
Investments available for sale, amortized cost 178,128 173,828
Marketable Securities 296,606 283,058
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 146,636 140,064
Restricted investments available for sale, equity, amortized cost 12,263 18,534
Restricted marketable equity securities 16,269 23,190
Corporate Debt Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 60,995 58,927
Unrestricted investments available for sale, debt, fair value 60,888 57,471
Restricted investments available for sale, debt, amortized cost 14,327 15,593
Restricted investments available for sale, debt, fair value 13,381 14,410
US Government Corporations and Agencies Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 56,631 46,811
Unrestricted investments available for sale, debt, fair value 55,718 44,186
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 3,736 3,787
Restricted investments available for sale, debt, fair value $ 3,714 $ 3,737