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Note 15 - Supplemental Disclosures of Cash Flow Information (Tables) | 9 Months Ended
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Sep. 30, 2025
Notes Tables |
Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] |
|  | Nine Months Ended |
|  | September 30, 2025 |  |  | September 30, 2024 |
|  | (in thousands) |
Cash paid for interest |  | $ | - |  |  | $ | (511 | )
Cash received for income taxes |  |  | - |  |  |  | (70 | )
Investing activities: |  |  |  |  |  |  |  |
Change in capital expenditure accruals |  |  | (305 | ) |  |  | (287 | )
Common stock issued for acquisition of industrial gas properties |  |  | (2,632 | ) |  |  | (2,678 | )
Asset retirement obligations |  |  | (1,900 | ) |  |  | (1,680 | )
Financing activities: |  |  |  |  |  |  |  |
Accrual for repurchase of common stock |  |  | - |  |  |  | 58 |

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