Note 3 - Oil and Gas Investments (Details Textual) $ in Millions |
2 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended | 106 Months Ended | |||
|---|---|---|---|---|---|---|---|---|
|
Aug. 31, 2018
USD ($)
|
Feb. 01, 2018
USD ($)
|
Nov. 30, 2025 |
Jun. 30, 2026
USD ($)
|
Jun. 30, 2025
USD ($)
|
Jun. 30, 2026
USD ($)
|
Sep. 30, 2026
USD ($)
|
Jun. 30, 2026 |
|
| Wells Participating to be Drilled | 263 | |||||||
| Oil and Gas, Development Well Drilled, Net Productive, Number | 249 | |||||||
| Gas and Oil Area Developed Net 1 | 5.00% | |||||||
| Oil and Gas, Cost Incurred, Development Cost | $ 3.2 | $ 1.4 | ||||||
| The 12 New Wells Elected to Participate in October and November 2025 [Member] | ||||||||
| Wells Participating to be Drilled | 12 | |||||||
| Oil and Gas, Cost Incurred, Development Cost | $ 4.8 | |||||||
| The 12 New Wells Elected to Participate in October and November 2025 [Member] | Forecast [Member] | ||||||||
| Oil and Gas, Cost Incurred, Development Cost | $ 9.0 | |||||||
| Oil [Member] | ||||||||
| Oil and Gas, Productive Well, Gross, Number | 450 | 450 | 450 | |||||
| Bakken Asset Acquisition [Member] | ||||||||
| Asset Acquisition, Consideration Transferred | $ 81.3 | $ 90.5 | ||||||