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Note 4 - Other Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Other Liabilities [Table Text Block] |
|  | December 31, |
|  | 2022 |  |  | 2021 |
Equipment maintenance and upgrades, non-related party |  | $ | — |  |  | $ | 367,000 |
Insurance |  |  | 591,000 |  |  |  | 340,000 |
Professional services |  |  | 92,000 |  |  |  | 90,000 |
Operating costs |  |  | 539,000 |  |  |  | 397,000 |
Other |  |  | 322,000 |  |  |  | 311,000 |
Total other accrued liabilities |  | $ | 1,544,000 |  |  | $ | 1,505,000 |

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- Definition Tabular disclosure of other liabilities. + References No definition available. + Details
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Period Type: | duration

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