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Note 3 - Revenue Recognition (Tables) | 3 Months Ended
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Mar. 31, 2025
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
Three Months Ended |
March 31, |
|  | U.S. |  |  | International |  |  | Total |
2025: |  |  |  |  |  |  |  |  |  |  |  |
Gas Utilities |  | $ | 273 |  |  | $ | — |  |  | $ | 273 |
DIET |  |  | 162 |  |  |  | 58 |  |  |  | 220 |
PTI |  |  | 156 |  |  |  | 63 |  |  |  | 219 |
|  | $ | 591 |  |  | $ | 121 |  |  | $ | 712 |
2024: |  |  |  |  |  |  |  |  |  |  |  |
Gas Utilities |  | $ | 265 |  |  | $ | — |  |  | $ | 265 |
DIET |  |  | 202 |  |  |  | 65 |  |  |  | 267 |
PTI |  |  | 200 |  |  |  | 45 |  |  |  | 245 |
|  | $ | 667 |  |  | $ | 110 |  |  | $ | 777 |

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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
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- References No definition available. + Details
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