Note 5 - Asset Retirement Obligations (Tables) |
3 Months Ended | |||||||||||||||||||||||||||||||||||
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Mar. 31, 2021 | ||||||||||||||||||||||||||||||||||||
| Notes Tables | ||||||||||||||||||||||||||||||||||||
| Schedule of Change in Asset Retirement Obligation [Table Text Block] |
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| X | ||||||||||
- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- References No definition available.
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