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Note 9 - Other Financial Statement Information - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Gross intangible assets	$ 1,265	$ 1,266
Goodwill	40	40
Less: Accumulated amortization	(1,225)	(1,221)
Intangible assets, net	40	45
Intellectual Property [Member]
Gross intangible assets	$ 1,225	$ 1,226

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