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