Note 9 - Income Taxes (Details Textual) |
Dec. 31, 2021
USD ($)
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| Domestic Tax Authority [Member] | |
| Operating Loss Carryforwards, Total | $ 102,096,000 |
| State and Local Jurisdiction [Member] | |
| Operating Loss Carryforwards, Total | 92,469,000 |
| Foreign Tax Authority [Member] | |
| Operating Loss Carryforwards, Total | $ 343,000 |
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- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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