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Note 10 - Investments in Marketable Securities - Marketable Securities and Restricted Marketable Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Marketable equity securities $ 107,655 $ 113,108
Unrestricted investments available for sale, debt, amortized cost 160,530 170,087
Unrestricted investments available for sale, debt, fair value 148,431 172,100
Restricted marketable equity securities 20,341 26,958
Investments available for sale, amortized cost 215,557 225,705
Marketable Securities, Total 276,427 312,166
Equity Securities [Member]    
Unrestricted investments available for sale, equity, amortized cost 30,176 30,176
Marketable equity securities 107,655 113,108
Restricted investments available for sale, equity, amortized cost 24,851 25,442
Restricted marketable equity securities 20,341 26,958
Corporate Debt Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 15,457 19,038
Unrestricted investments available for sale, debt, fair value 14,912 18,843
Restricted investments available for sale, debt, amortized cost 60,262 60,816
Restricted investments available for sale, debt, fair value 56,273 62,936
Asset-Backed Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 501 1,481
Unrestricted investments available for sale, debt, fair value 490 1,469
Restricted investments available for sale, debt, amortized cost 26,855 32,918
Restricted investments available for sale, debt, fair value 24,746 33,301
US Government Corporations and Agencies Securities [Member]    
Unrestricted investments available for sale, debt, amortized cost 9,464 15,082
Unrestricted investments available for sale, debt, fair value 9,157 14,998
Restricted investments available for sale, debt, amortized cost 43,083 33,052
Restricted investments available for sale, debt, fair value 38,149 32,630
US States and Political Subdivisions Debt Securities [Member]    
Restricted investments available for sale, debt, amortized cost 4,908 7,700
Restricted investments available for sale, debt, fair value $ 4,704 $ 7,923