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Note 6 - Revenue (Tables) | 6 Months Ended
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Jun. 30, 2022
Notes Tables |
Disaggregation of Revenue [Table Text Block] |
|  | Three Months Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Well construction |  | $ | 121,794 |  |  | $ | - |  |  | $ | 233,229 |  |  | $ | - |
Well management |  |  | 191,830 |  |  |  | 176,251 |  |  |  | 360,872 |  |  |  | 332,546 |
Total |  | $ | 313,624 |  |  | $ | 176,251 |  |  | $ | 594,101 |  |  | $ | 332,546 |
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] |
|  | June 30, |  |  | December 31, |
|  | 2022 |  |  | 2021 |
Accounts receivable, net |  | $ | 244,150 |  |  | $ | 236,158 |
Unbilled receivables |  | $ | 137,014 |  |  | $ | 94,659 |
Deferred revenue |  | $ | 13,001 |  |  | $ | 17,038 |

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