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Note 6 - Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Finite-lived intangible assets, gross | $ 619 | $ 656
Finite-lived intangible assets, accumulated amortization | 500 | 473
Intangible assets, net | 119 | 183
Patents [Member] |  |
Finite-lived intangible assets, gross | 565 | 602
Finite-lived intangible assets, accumulated amortization | 446 | 422
Intangible assets, net | 119 | 180
Certifications [Member] |  |
Finite-lived intangible assets, gross | 54 | 54
Finite-lived intangible assets, accumulated amortization | 54 | 51
Intangible assets, net | $ 0 | $ 3

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