Note 8 - Fair Value Disclosures - Fair Value Measurements of Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent) (Details) - USD ($) $ in Thousands		Mar. 31, 2026	Dec. 31, 2025
lternative investment		$ 11,976	$ 12,486
CK Capital Value Fund [Member]
lternative investment	[1]	1,184	1,171
CREO JV [Member]
lternative investment	[2]	8,891	8,940
Unfunded commitments	[2]	7,268	7,268
U.S. Insurance JV [Member]
lternative investment	[3]	$ 1,901	$ 2,375

[1] CK Capital Value Fund invests primarily in office buildings in the Netherlands.

[2] CREO JV invests primarily in multi-family commercial real estate mortgage-backed loans.

[3] U.S. Insurance JV invests in USD denominated debt issued by small and medium size insurance and reinsurance companies.