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Note 7 - Stock-based Compensation - Stock Option Plan Cost (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair value of options vested	$ 191,000	$ 192,000	$ 384,000	$ 199,000
Intrinsic value of options exercised	260,000	25,000	874,000	561,000
Cash received from option exercises	353,000	0	936,000	367,000
Tax benefit from option exercises	24,000	5,000	43,000	74,000
Compensation cost	93,000	131,000	256,000	350,000
Tax benefit associated with compensation cost	$ 5,000	$ 13,000	$ 14,000	$ 33,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479983/718-10-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment arrangement.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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