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Note 11 - Business Segment and Geographic Financial Data (Tables) | 6 Months Ended
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Jun. 30, 2024
Notes Tables |
Schedule of Segment Reporting Information, by Segment [Table Text Block] |
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Three months ended June 30, 2024 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 3,949 |  |  | $ | 3,093 |  |  | $ | — |  |  | $ | 7,042 |
Cost of sales |  |  | (2,405 | ) |  |  | (1,685 | ) |  |  | — |  |  |  | (4,090 | )
Gross margin |  |  | 1,544 |  |  |  | 1,408 |  |  |  | — |  |  |  | 2,952 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (3,245 | ) |  |  | (3,245 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (422 | ) |  |  | (422 | )
Operating income (loss) from operations |  | $ | 1,544 |  |  | $ | 1,408 |  |  | $ | (3,667 | ) |  | $ | (715 | )
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Three months ended June 30, 2023 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 3,422 |  |  | $ | 2,039 |  |  | $ | — |  |  | $ | 5,461 |
Cost of sales |  |  | (2,347 | ) |  |  | (1,118 | ) |  |  | — |  |  |  | (3,465 | )
Gross margin |  |  | 1,075 |  |  |  | 921 |  |  |  | — |  |  |  | 1,996 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (2,915 | ) |  |  | (2,915 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (413 | ) |  |  | (413 | )
Operating income (loss) from operations |  | $ | 1,075 |  |  | $ | 921 |  |  | $ | (3,328 | ) |  | $ | (1,332 | )
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Six months ended June 30, 2024 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 6,267 |  |  | $ | 5,732 |  |  | $ | — |  |  | $ | 11,999 |
Cost of sales |  |  | (3,833 | ) |  |  | (3,185 | ) |  |  | — |  |  |  | (7,018 | )
Gross margin |  |  | 2,434 |  |  |  | 2,547 |  |  |  | — |  |  |  | 4,981 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (6,590 | ) |  |  | (6,590 | )
Research and development |  |  | — |  |  |  | — |  |  |  | (798 | ) |  |  | (798 | )
Operating income (loss) from operations |  | $ | 2,434 |  |  | $ | 2,547 |  |  | $ | (7,388 | ) |  | $ | (2,407 | )
|  | Air Pollution |  |  | FUEL CHEM |  |  |  |  |  |  |  |  |
Six months ended June 30, 2023 |  | Control Segment |  |  | Segment |  |  | Other |  |  | Total |
Revenues from external customers |  | $ | 6,981 |  |  | $ | 5,767 |  |  | $ | — |  |  | $ | 12,748 |
Cost of sales |  |  | (4,941 | ) |  |  | (3,006 | ) |  |  | — |  |  |  | (7,947 | )
Gross margin |  |  | 2,040 |  |  |  | 2,761 |  |  |  | — |  |  |  | 4,801 |
Selling, general and administrative |  |  | — |  |  |  | — |  |  |  | (6,160 | ) |  |  | (6,160 | )
Research and development |  | $ | — |  |  | $ | — |  |  | $ | (631 | ) |  | $ | (631 | )
Operating income (loss) from operations |  | $ | 2,040 |  |  | $ | 2,761 |  |  | $ | (6,791 | ) |  | $ | (1,990 | )
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block] |
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2024 |  |  | 2023 |  |  | 2024 |  |  | 2023 |
Revenues: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 4,471 |  |  | $ | 4,316 |  |  | $ | 8,066 |  |  | $ | 10,297 |
Foreign |  |  | 2,571 |  |  |  | 1,145 |  |  |  | 3,933 |  |  |  | 2,451 |
|  | $ | 7,042 |  |  | $ | 5,461 |  |  | $ | 11,999 |  |  | $ | 12,748 |
|  | June 30, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Assets: |  |  |  |  |  |  |  |
United States |  | $ | 45,525 |  |  | $ | 46,487 |
Foreign |  |  | 3,469 |  |  |  | 3,901 |
|  | $ | 48,994 |  |  | $ | 50,388 |

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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 -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-41 + 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 -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-22 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-30 + Details
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