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Note 3 - Revenue 1 (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2025 USD ($) | Dec. 31, 2024 USD ($)
Contract with Customer, Liability, Current | $ 960 |  | $ 960 |  | $ 1,026 | $ 721
Contract with Customer, Liability, Revenue Recognized | $ 155 | $ 171 | $ 607 | $ 543 |  |
Contract with Customer, Contracts in Progress, Number of Contracts Identified as Loss Contracts | 0 |  | 0 |  | 0 |
Revenue, Remaining Performance Obligation, Amount | $ 14,308 |  | $ 14,308 |  |  |
Air Pollution Control [Member] |  |  |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | $ 1,223 |  | $ 1,223 |  | $ 887 | $ 2,075

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