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Note 3 - Investments and Restricted Investments - Summaries of the Amortized Cost, Unrealized Gains, Unrealized Losses, and Fair Value by Investment Type (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Investments, available for sale, amortized cost	$ 0	$ 18,934
Investments, available for sale, gross unrealized gains	0	53
Investments, available for sale, gross unrealized losses	0	0
Investments, available for sale, estimated fair value	0	18,987
Restricted investments, held-to-maturity, amortized cost	13,814	13,816
Restricted investments, gross unrealized gains	108	85
Restricted investments, gross unrealized losses	(216)	(353)
Restricted investments, estimated fair value	13,706	13,548
US Treasury Securities [Member]
Investments, available for sale, amortized cost	0	18,934
Investments, available for sale, gross unrealized gains	0	53
Investments, available for sale, gross unrealized losses	0	0
Investments, available for sale, estimated fair value	0	18,987
Restricted investments, held-to-maturity, amortized cost	13,814	13,816
Restricted investments, gross unrealized gains	108	85
Restricted investments, gross unrealized losses	(216)	(353)
Restricted investments, estimated fair value	$ 13,706	$ 13,548

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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