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v3.23.3

Note 1 - Organization and Description of Business and Significant Accounting Policies (Details Textual) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 22, 2022 USD ($) | Sep. 30, 2023 USD ($) shares | Sep. 30, 2022 shares | Sep. 30, 2017 USD ($) | Apr. 26, 2023 | Aug. 31, 2022 shares | Aug. 31, 2010 shares
Management Contracts Impairment Amount | $ |  | $ 0 |  |  |  |  |
Increase (Decrease) in Assets Under Management | $ | $ 43,000,000 |  |  |  |  |  |
Percentage of Current Net Assets to Be Paid |  |  |  |  | 1.25% |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Percentage of Outstanding Stock Maximum |  | 50.00% |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year) |  |  |  | 10 years |  |  |
Maximum Aggregate Fair value Of Options Granted to Individual | $ |  |  |  | $ 100,000 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) |  | 4 years |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  | 3,835,550 |  |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 22,500,000 | 22,500,000 |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance (in shares) |  | 1,443,310 |  |  |  |  |
Stock Buyback Program [Member] |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares) |  |  |  |  |  | 2,000,000 | 1,500,000
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased (in shares) |  |  | 1,096,368 |  |  |  |
Dividend Reinvestment and Stock Purchase Plan (DRSPP) [Member] |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 9,535 | 7,612 |  |  |  |
Common Stock, Shares Authorized (in shares) |  | 1,470,000 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage |  | 25.00% |  |  |  |  |
Vident Advisory, LLC [Member] |  |  |  |  |  |  |
Capitalized Contract Cost, Net | $ |  | $ 200,000 |  |  |  |  |
Community Capital Management, LLC [Member] | Legal Costs [Member] |  |  |  |  |  |  |
Capitalized Contract Cost, Net | $ |  | 200,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Gain (Loss) on Investments | $ |  | $ 1,000,000 |  |  |  |  |
Maximum [Member] | Stock Appreciation Rights (SARs) [Member] |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Maximum Number of Shares Per Employee (in shares) |  | 75,000 |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Exercise Price Percentage |  |  |  | 110.00% |  |  |
Minimum [Member] | Incentive Stock Option Plan [Member] |  |  |  |  |  |  |
Shareholder Threshold Percentage |  |  |  | 10.00% |  |  |
Employee Retention Credit [Member] |  |  |  |  |  |  |
Income Tax Credits and Adjustments | $ |  | $ 300,000 |  |  |  |  |
Open-end Mutual Funds [Member] |  |  |  |  |  |  |
Number of Funds |  | 16 |  |  |  |  |
Exchange-traded Fund [Member] |  |  |  |  |  |  |
Number of Funds |  | 1 |  |  |  |  |

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