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Note 3 - Revenue 1 (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Contract with Customer, Liability, Current | $ 276 |  | $ 276 |  | $ 1,279 | $ 372
Contract with Customer, Liability, Revenue Recognized | $ 438 | $ 9 | $ 1,221 | $ 368 |  |
Contract with Customer, Contracts in Progress, Number of Contracts Identified as Loss Contracts | 0 |  | 0 |  | 0 |
Revenue, Remaining Performance Obligation, Amount | $ 4,250 |  | $ 4,250 |  |  |
Air Pollution Control [Member] |  |  |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 1,543 |  | 1,543 |  | $ 2,285 | 3,082
FUEL CHEM [Member] |  |  |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | $ 0 |  | $ 0 |  | $ 0 | $ 0

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
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