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Note 15 - Injection Wells Suspension (Details Textual) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2019 | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells |  | 2 | 2
Wells and Related Equipment and Facilities [Member] |  |  |
Asset Impairment Charges, Total | $ 3.3 |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Details
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