Note 12 - Stockholders' Equity - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Stock-based compensation expense | $ 605 | $ 679 |
| Cost of Sales [Member] | ||
| Stock-based compensation expense | 25 | 31 |
| Research and Development Expense [Member] | ||
| Stock-based compensation expense | 18 | 42 |
| General and Administrative Expense [Member] | ||
| Stock-based compensation expense | $ 562 | $ 606 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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| X | ||||||||||
- Details
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