Note 2 - Investments in Bond Securities - Maturities of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
One year or less, amortized cost	$ 0	$ 2,687
One year or less, fair value	0	2,692
Greater than one year through five years, amortized cost	0	0
Greater than one year through five years, fair value	0	0
Amortized cost	0	2,687
Fair value	$ 0	$ 2,692