v3.26.1
Note 10 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Unrestricted investments available for sale, equity, amortized cost $ 24,734 $ 24,734
Marketable equity securities 170,981 162,972
Restricted marketable equity securities 19,397 17,197
Investments available for sale, amortized cost 165,152 167,290
Investments available for sale, fair value 309,745 303,462
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 170,981 162,972
Restricted investments available for sale, equity, amortized cost 13,326 13,104
Restricted marketable equity securities 19,397 17,197
Corporate Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 60,525 58,458
Restricted investments available for sale, debt, fair value 60,156 58,898
Asset-Backed Securities [Member]    
Restricted investments available for sale, debt, amortized cost 16,698 16,886
Restricted investments available for sale, debt, fair value 15,971 16,236
US Government Corporations and Agencies Securities [Member]    
Restricted investments available for sale, debt, amortized cost 42,151 43,384
Restricted investments available for sale, debt, fair value 40,965 42,836
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 2,276 5,282
Restricted investments available for sale, debt, fair value $ 2,275 $ 5,323