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Note 12 - Business Segment and Geographic Financial Data (Tables) | 12 Months Ended
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Dec. 31, 2022
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
For the year ended December 31, 2022 |  | Air Pollution Control Segment |  |  | FUEL CHEM Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 10,597 |  |  | $ | 16,344 |  |  | $ | — |  |  | $ | 26,941 |
Cost of sales |  |  | (6,924 | ) |  |  | (8,374 | ) |  |  | — |  |  |  | (15,298 | )
Gross margin |  |  | 3,673 |  |  |  | 7,970 |  |  |  | — |  |  |  | 11,643 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (12,275 | ) |  |  | (12,275 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (895 | ) |  |  | (895 | )
Operating income (loss) from continuing operations |  | $ | 3,673 |  |  | $ | 7,970 |  |  | $ | (13,170 | ) |  | $ | (1,527 | )
For the year ended December 31, 2021 | Air Pollution Control Segment |  | FUEL CHEM Segment |  | Other |  | Total |
Revenues from external customers | $ | 6,896 |  | $ | 17,365 |  | $ | — |  | $ | 24,261 |
Cost of sales |  | (3,529 | ) |  | (8,834 | ) |  | — |  |  | (12,363 | )
Gross margin |  | 3,367 |  |  | 8,531 |  |  | — |  |  | 11,898 |
Selling, general and administrative |  | — |  |  | — |  |  | (12,055 | ) |  | (12,055 | )
Research and development |  | — |  |  | — |  |  | (1,332 | ) |  | (1,332 | )
Operating income (loss) from continuing operations | $ | 3,367 |  | $ | 8,531 |  | $ | (13,387 | ) | $ | (1,489 | )
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
For the years ended December 31, |  | 2022 |  |  | 2021 |
Revenues: |  |  |  |  |  |  |  |
United States |  | $ | 20,311 |  |  | $ | 19,515 |
Foreign |  |  | 6,630 |  |  |  | 4,746 |
|  | $ | 26,941 |  |  | $ | 24,261 |
As of December 31, |  | 2022 |  |  | 2021 |
Assets: |  |  |  |  |  |  |  |
United States |  | $ | 47,007 |  |  | $ | 46,271 |
Foreign |  |  | 3,117 |  |  |  | 3,703 |
|  | $ | 50,124 |  |  | $ | 49,974 |

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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e9038-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8906-108599 + Details
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