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v3.23.2

Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022
Investment Plan, Maximum Amount. Approved |  | $ 20,000
Inventory, Net | $ 528 | 392
Equipment Contstructed for Resale [Member] |  |
Inventory, Net | 207 | 207
Spare Parts [Member] |  |
Inventory, Net | 321 | 185
In Process Equipment [Member] |  |
Inventory, Net | $ 632 | $ 634
Minimum [Member] |  |
Debt Securities, Held-to-maturity, Maturity Term (Month) | 3 months |
Maximum [Member] |  |
Debt Securities, Held-to-maturity, Maturity Term (Month) | 36 months |
Asset Pledged as Collateral [Member] | Letter of Credit [Member] |  |
Restricted Cash and Investments | $ 621 |
Asset Pledged as Collateral [Member] | Letter of Credit [Member] | Varying Maturity Dates Expiring No Later Than June 30, 2024 [Member] |  |
Restricted Cash and Investments | 322 |
Asset Pledged as Collateral [Member] | Letter of Credit [Member] | Latest Maturity Date No Later Than November 30, 2025 [Member] |  |
Restricted Cash and Investments | $ 299 |

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