Note 11 - Stockholders' Equity - Stock-based Compensation (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Stock-based compensation	$ 39,000	$ 267,000
Cost of Sales [Member]
Stock-based compensation	17,000	18,000
Selling, General and Administrative Expenses [Member]
Stock-based compensation		229,000
Research and Development Expense [Member]
Stock-based compensation	$ 22,000	$ 20,000

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

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

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