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Note 7 - Stock Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Stock-based compensation expense	$ 518	$ 413	$ 963	$ 719
The 2012 Director Stock Incentive Plan [Member]
Stock-based compensation expense	173	263	287	372
The 2012 Omnibus Stock Incentive Plan [Member]
Stock-based compensation expense	118	150	259	315
The 2022 Omnibus Stock Incentive Plan [Member]
Stock-based compensation expense	227	0	383	0
The 2002 Employee Stock Purchase Plan [Member]
Stock-based compensation expense	$ 0	$ 0	$ 34	$ 32

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 S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

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X

- Details

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- Details

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- Details

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- Details

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