v3.26.3
Note 10 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Unrestricted investments available for sale, equity, amortized cost $ 24,734 $ 24,734
Marketable equity securities 154,530 162,972
Restricted marketable equity securities 19,153 17,197
Investments available for sale, amortized cost 164,088 167,290
Investments available for sale, fair value 287,878 303,462
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 154,530 162,972
Restricted investments available for sale, equity, amortized cost 14,229 13,104
Restricted marketable equity securities 19,153 17,197
Corporate Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 60,124 58,458
Restricted investments available for sale, debt, fair value 58,064 58,898
Asset-Backed Securities [Member]    
Restricted investments available for sale, debt, amortized cost 16,399 16,886
Restricted investments available for sale, debt, fair value 15,283 16,236
US Government Corporations and Agencies Securities [Member]    
Restricted investments available for sale, debt, amortized cost 42,155 43,384
Restricted investments available for sale, debt, fair value 39,846 42,836
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 1,005 5,282
Restricted investments available for sale, debt, fair value $ 1,002 $ 5,323