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Note 6 - Segment Reporting (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024
Number of Reportable Segments |  |  | 2 |  |
Geographic Concentration Risk [Member] | Revenue Benchmark [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage | 80.00% | 78.00% | 79.00% | 77.00% |
Geographic Concentration Risk [Member] | Long-lived Assets [Member] | UNITED STATES |  |  |  |  |
Concentration Risk, Percentage |  |  | 74.00% |  | 76.00%
Clean Energy Product [Member] |  |  |  |  |
Provision for Product Charges |  | $ 0 |  | $ 365 |
Certain Patent Lawsuits [Member] |  |  |  |  |
Legal Fees | $ 1,696 | $ 363 | $ 3,188 | $ 2,533 |
Class Action Lawsuits [Member] |  |  |  |  |
Legal Fees | 2,540 |  | 3,883 |  |
Government Inquiries and Other Matters [Member] |  |  |  |  |
Legal Fees | $ 675 |  | $ 1,591 |  |

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