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Note 3 - Investment Securities - Amortized Cost of Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Equity Securities, FV-NI, Amortized Cost	$ 1,452		$ 1,452		$ 1,425
Equity Securities, FV-NI, Fair Value	1,388		1,388		1,336
Net gains (losses) recognized during the period on equity securities	49	$ (33)	25	$ (78)
Less net losses recognized during the period on equity securities sold during the period	0	0	0	(61)
Net unrealized gains (losses) recognized during the reporting period on equity securities still held at period end	49	$ (33)	25	$ (17)
Mutual Fund [Member]
Equity Securities, FV-NI, Amortized Cost	1,442		1,442		1,415
Equity Securities, FV-NI, Fair Value	1,294		1,294		1,240
Equity Securities [Member]
Equity Securities, FV-NI, Amortized Cost	10		10		10
Equity Securities, FV-NI, Fair Value	$ 94		$ 94		$ 96

X

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Cost of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Excludes equity method investment and investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 210
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-Section S99
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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 220
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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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