Note 9 - Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| Net operating loss and credits | $ 32,098,000 | $ 27,963,000 |
| Stock compensation | 3,026,000 | 2,837,000 |
| Accrued liabilities | 504,000 | 11,000 |
| Fixed assets and intangibles | (2,231,000) | (4,812,000) |
| State taxes | 11,000 | 1,000 |
| Capitalized research and development costs | 2,002,000 | 0 |
| Total net deferred tax assets (liabilities) | 35,410,000 | 26,000,000 |
| Valuation allowance | (35,723,000) | (26,518,000) |
| Total net deferred tax assets (liabilities), net of valuation allowance | $ (313,000) | $ (518,000) |
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to capitalized research and development. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment and from intangible assets. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from state taxes. No definition available.
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from accrued liabilities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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