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Note 10 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Marketable equity securities $ 135,246 $ 128,590
Unrestricted investments available for sale, debt, amortized cost 185,217 183,437
Unrestricted investments available for sale, debt, fair value 189,175 189,835
Restricted marketable equity securities 5,083 4,680
Investments available for sale, amortized cost 220,176 218,396
Marketable Securities, Total 329,504 323,105
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 135,246 128,590
Restricted investments available for sale, equity, amortized cost 4,783 4,783
Restricted marketable equity securities 5,083 4,680
Corporate Debt Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 26,540 25,812
Unrestricted investments available for sale, debt, fair value 26,420 25,778
Restricted investments available for sale, debt, amortized cost 63,907 61,709
Restricted investments available for sale, debt, fair value 67,205 66,247
Asset-backed Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 3,961 2,485
Unrestricted investments available for sale, debt, fair value 3,949 2,480
Restricted investments available for sale, debt, amortized cost 38,156 40,655
Restricted investments available for sale, debt, fair value 39,140 41,769
US Government Corporations and Agencies Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 19,148 19,519
Unrestricted investments available for sale, debt, fair value 19,123 19,504
Restricted investments available for sale, debt, amortized cost 22,723 20,760
Restricted investments available for sale, debt, fair value 22,241 21,159
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 10,782 12,497
Restricted investments available for sale, debt, fair value $ 11,097 $ 12,898