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Note 4 - Other Accrued Liabilities (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2023
Notes Tables |
Other Liabilities [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2023 |  |  | 2022 |
Insurance |  | $ | 135,000 |  |  | $ | 591,000 |
Professional services |  |  | 323,000 |  |  |  | 92,000 |
Operating costs |  |  | 624,000 |  |  |  | 539,000 |
Other |  |  | 314,000 |  |  |  | 322,000 |
Total other accrued liabilities |  | $ | 1,396,000 |  |  | $ | 1,544,000 |

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- Definition Tabular disclosure of other liabilities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration