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Note 10 - Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Schedule of Change in Asset Retirement Obligation [Table Text Block] |
Balance, December 31, 2018 |  | $ | 1,824,419 |
Additions |  |  | 1,294 |
Accretion expense |  |  | 65,932 |
Liabilities settled |  |  | - |
Balance, June 30, 2019 |  | $ | 1,891,645 |

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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