Note 2 - Investments in Bond Securities - Amortized Cost to Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized cost	$ 0	$ 2,687
Unrealized gains	0	5
Fair value	$ 0	$ 2,692

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details