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Note 15 - Supplemental Disclosures of Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Cash paid for interest	$ 0	$ (511)
Cash received for income taxes	0	(70)
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)
Accrual for repurchase of common stock	$ 0	$ 58

X

- Definition

Amount of cash paid for interest, excluding capitalized interest, classified as operating activity. Includes, but is not limited to, payment to settle zero-coupon bond for accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
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-Paragraph 25
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-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-2

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X

- Definition

The fair value of stock issued in noncash financing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-5

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X

- Definition

Amount of accrual for repurchase of common stock.

+ References

No definition available.

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X

- Definition

Represents the amount of asset retirement obligation incurred.

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No definition available.

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X

- Definition

The cash received for income taxes during the period.

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X

- Definition

Represents the amount of change in capital expenditure accruals during the period.

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No definition available.

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