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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
Restricted Cash and Cash Equivalents, Total | $ 1,990 |
Investment Plan, Maximum Amount. Approved | 10,000 |
Inventory, Net, Total | 405 | $ 348
Equipment Contstructed for Resale [Member] |  |
Inventory, Net, Total | 208 | 227
Spare Parts [Member] |  |
Inventory, Net, Total | $ 197 | $ 121
Minimum [Member] |  |
Debt Securities, Held-to-maturity, Maturity Term (Month) | 3 months |
Maximum [Member] |  |
Debt Securities, Held-to-maturity, Maturity Term (Month) | 36 months |
Money Market Funds [Member] |  |
Restricted Cash and Investments, Total | $ 10,000 |

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