Note 9 - Available-for-sale Securities Measured at Fair Value Using Significant Unobservable Inputs (Details) - USD ($)	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Included in earnings	$ 0
Fair Value, Inputs, Level 3 [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, beginning of year	52,000	$ 52,000
Payments received	(1,000)	(1,000)
Included in earnings	0	0
Included in other comprehensive (loss) income	0	1,000
Transfers in and/or out of Level 3	0	0
Balance, end of year	$ 51,000	$ 52,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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