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Note 4 - Insurance SPAC Investments and Other Recent Events - Schedule of Consolidated Other Investments Shares (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Other Investments, Fair Value Disclosure	$ 56,033	$ 58,540
Operating LLC [Member] | MetroMile, Shares freely Tradeable [Member]
Other Investments, Fair Value Disclosure	0
Operating LLC [Member] | Metromile, Shares Become Freely Tradeable When Share Price Exceedes a Specified Amount, Tranche One [Member]
Other Investments, Fair Value Disclosure	2,750
Operating LLC [Member] | SFT, Shares Freely Tradeable [Member]
Other Investments, Fair Value Disclosure	445
Operating LLC [Member] | SFT, Shares Become Freely Tradeable When Share Price Exceedes a Specified Amount, Tranche One [Member]
Other Investments, Fair Value Disclosure	1,341
Operating LLC [Member] | Metromile, Shares Become Freely Tradeable When Share Price Exceedes a Specified Amount, Tranche Two [Member]
Other Investments, Fair Value Disclosure	2,750
Operating LLC [Member] | SFT, Shares Become Freely Tradeable When Share Price Exceedes a Specified Amount, Tranche Two [Member]
Other Investments, Fair Value Disclosure	1,337
Operating LLC [Member] | MetroMile [Member]
Other Investments, Fair Value Disclosure	5,500
Operating LLC [Member] | SFT, Shares Become Freely Tradeable When Share Price Exceedes a Specified Amount, Tranche Three [Member]
Other Investments, Fair Value Disclosure	1,333
Operating LLC [Member] | SFT, Shares Become Freely Tradeable When Share Price Exceedes a Specified Amount, Tranche Four [Member]
Other Investments, Fair Value Disclosure	1,329
Operating LLC [Member] | SFT [Member]
Other Investments, Fair Value Disclosure	$ 5,785

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