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Note 5 - Investments - Fair Value of Financial Instruments on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - HC Series B Stock [Member] - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
HC Series B Stock	$ 5,166	$ 9,256
Fair Value, Inputs, Level 1 [Member]
HC Series B Stock	0	0
Fair Value, Inputs, Level 2 [Member]
HC Series B Stock	0	0
Fair Value, Inputs, Level 3 [Member]
HC Series B Stock	$ 5,166	$ 9,256

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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