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Note 4 - Segment Information (Details Textual) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | May 16, 2022 USD ($)
Number of Reportable Segments |  |  | 2 |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Exxon [Member] | Oil and Gas [Member] |  |  |  |  |
Concentration Risk, Percentage | 100.00% | 100.00% | 100.00% | 100.00% |
Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  | $ 50

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