Note 5 - Other Investments (Details Textual) - USD ($) |
9 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Proceeds from Equity Method Investment, Distribution | $ 2,365,166 | $ 2,658,656 | |
| RGC Midstream LLC [Member] | MVP [Member] | |||
| Equity Method Investment, Ownership Percentage | 1.00% | ||
| Proceeds from Equity Method Investment, Distribution | $ 2,400,000 | $ 2,700,000 | |
| X | ||||||||||
- Definition Amount of distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|