Note 7 - Financial Instruments - Other Investments, at Fair Value 2 (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Other Investments, Fair Value Disclosure	$ 80,205	$ 57,258
Investment, Identifier [Axis]: CCMAvaxOneTechnologyMember
Other Investments, Fair Value Disclosure	390	1,363
Investment, Identifier [Axis]: CCMBakktIncMember
Other Investments, Fair Value Disclosure	976	0
Investment, Identifier [Axis]: CCMCriticalMetalsCorpMember
Other Investments, Fair Value Disclosure	2,481	1,506
Investment, Identifier [Axis]: CCMHadronEnergyIncMember
Other Investments, Fair Value Disclosure	265	0
Investment, Identifier [Axis]: CCMNakamotoIncMember
Other Investments, Fair Value Disclosure	0	1,802
Investment, Identifier [Axis]: CCMNamibMineralsIncMember
Other Investments, Fair Value Disclosure	1,082	2,779
Investment, Identifier [Axis]: CCMOceanPalIncMember
Other Investments, Fair Value Disclosure	0	2,930
Investment, Identifier [Axis]: CCMProCapFinancialIncMember
Other Investments, Fair Value Disclosure	647	1,521
Investment, Identifier [Axis]: CCMUSBCIncMember
Other Investments, Fair Value Disclosure	0	2,482
Investment, Identifier [Axis]: NonCCMPayoneerMember
Other Investments, Fair Value Disclosure	1,997	0
Investment, Identifier [Axis]: NonCCMProCapFinancialIncMember
Other Investments, Fair Value Disclosure	$ 3,314	$ 7,595