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Note 11 - Other Stock Plans (Details Textual) - USD ($) | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Maximum Amount Allowed For Dividend Reinvestment and Stock Purchase Plan | $ 100,000 |
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) | 30,027 | 33,226
Stock Available for Issuance under Dividend Reinvestment Plan (in shares) | 202,371 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 16,000 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) |  | 4,000
Restricted Stock [Member] | Restricted Stock Plan for Outside Directors [Member] |  |
Share Based Compensation by Share Based Payment Award, Maximum Allowed Percentage of Retainer Fee Paid Monthly in Common Stock | 100.00% |
Share Based Compensation by Share Based Payment Award, Percentage of Retainer Fee Paid Monthly in Common Stock | 40.00% |
Share Based Compensation by Share Based Payment Award, Minimum Shares Owned Requirement (in shares) | 10,000 |
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture | $ 331,030 | $ 299,200
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) | 0 | 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 149,022 |
Restricted Stock [Member] | RGC Resources Inc. Restricted Stock Plan [Member] |  |
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture | $ 673,057 | $ 660,424
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 286,560 |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 222,026 | $ 285,683
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures in Period (in shares) | 0 | 0
Restricted Stock [Member] | Stock Bonus Plan [Member] |  |
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture | $ 27,500 | $ 24,841
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) | 1,766 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) | 1,352 | 1,562

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- Definition The maximum allowed percentage of retainer fee paid monthly in common stock under share based payment arrangement. + References No definition available. + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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