Note 4 - Investments - Net Investment Income (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Net investment income	$ 744	$ 442	$ 1,545	$ 1,287
Cash and Cash Equivalents [Member]
Investment Income, Interest	695	442	1,489	1,287
Convertible Promissory Note Receivable [Member]
Investment Income, Interest	$ 49	$ 0	$ 56	$ 0

Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/exampleRef
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Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
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