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Note 3 - Revenue 1 (Details Textual) Pure in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Contract with Customer, Liability, Current | $ 578 |  | $ 578 |  | $ 390 | $ 850
Contract with Customer, Liability, Revenue Recognized | $ 20 | $ 49 | $ 250 | $ 157 |  |
Contract with Customer, Contracts in Progress, Number of Contracts Identified as Loss Contracts | 0 |  | 0 |  | 0 |
Revenue, Remaining Performance Obligation, Amount | $ 10,547 |  | $ 10,547 |  |  |
Air Pollution Control [Member] |  |  |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss, Total | 1,106 |  | 1,106 |  | $ 1,277 | 2,079
FUEL CHEM [Member] |  |  |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss, Total | $ 0 |  | $ 0 |  | $ 0 | $ 269

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130549-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130531-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=126919976&loc=SL49130533-203044 + Details
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