Performance Management |
Oct. 28, 2026 |
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| James Small Cap Fund | |||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart and performance table below illustrate the variability of the Funds returns, which provides some indication of the risks of investing in the Fund by showing changes in the Funds performance from year to year and by showing how the Funds average annual total returns over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. Of course, the Funds past performance is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available at no cost by visiting www.jamesinvestment.com or by calling 1-800-99-JAMES (1-800-995-2637).
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| Performance Past Does Not Indicate Future [Text] | Of course, the Funds past performance is not necessarily an indication of how the Fund will perform in the future. | ||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and performance table below illustrate the variability of the Funds returns, which provides some indication of the risks of investing in the Fund by showing changes in the Funds performance from year to year and by showing how the Funds average annual total returns over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. | ||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Returns (Years ended December 31): | ||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The Funds year-to-date return as of September 30, 2026 was 12.92%. |
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| Year to Date Return, Label [Optional Text] | The Funds year-to-date return | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 12.92% | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 26.12% | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (35.01%) | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns (for the period ended December 31, 2025) | ||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed | Effective March 31, 2026, the Fund changed its broad-based securities market index from the VettaFi US Equity 3000 Index to the Bloomberg US 3000 Total Return Index. | ||||||||||||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. | ||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts. | ||||||||||||||||||||||||||||||||||
| Performance [Table] |
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| Index No Deduction for Fees, Expenses, or Taxes [Text] | reflects no deduction for fees, expenses or taxes | ||||||||||||||||||||||||||||||||||
| Performance Table Closing [Text Block] | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts. |
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| Performance Availability Website Address [Text] | www.jamesinvestment.com | ||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | 1-800-99-JAMES (1-800-995-2637) | ||||||||||||||||||||||||||||||||||
| JAMES MICRO CAP FUND | |||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Fund from year to year and by showing how the average annual total returns of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. Of course, the past performance of the Fund is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available at no cost by visiting www.jamesinvestment.com or by calling 1-800-99-JAMES (1-800-995-2637).
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| Performance Past Does Not Indicate Future [Text] | Of course, the past performance of the Fund is not necessarily an indication of how the Fund will perform in the future. | ||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Fund from year to year and by showing how the average annual total returns of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. | ||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Returns (Years ended December 31): | ||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The Funds year-to-date return as of September 30, 2026 was 12.21%. |
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| Year to Date Return, Label [Optional Text] | The Funds year-to-date return | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 12.21% | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 22.92% | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (37.18%) | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns (for the period ended December 31, 2025) | ||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed | Effective March 31, 2026, the Fund changed its broad-based securities market index from the VettaFi US Equity 3000 Index to the Bloomberg US 3000 Total Return Index. | ||||||||||||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. | ||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts. | ||||||||||||||||||||||||||||||||||
| Performance [Table] |
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| Index No Deduction for Fees, Expenses, or Taxes [Text] | reflects no deduction for fees, expenses or taxes | ||||||||||||||||||||||||||||||||||
| Performance Table Closing [Text Block] | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts. |
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| Performance Availability Website Address [Text] | www.jamesinvestment.com | ||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | 1-800-99-JAMES (1-800-995-2637) | ||||||||||||||||||||||||||||||||||
| James Aggressive Allocation Fund | |||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Fund from year to year and by showing how the average annual total returns of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. Of course, the past performance of the Fund is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available at no cost by visiting www.jamesinvestment.com or by calling 1-800-99-JAMES (1-800-995-2637). |
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| Performance Past Does Not Indicate Future [Text] | Of course, the past performance of the Fund is not necessarily an indication of how the Fund will perform in the future. | ||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Fund from year to year and by showing how the average annual total returns of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. | ||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Returns (Years ended December 31): | ||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The Funds year-to-date return as of September 30, 2026 was 9.09%.
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| Year to Date Return, Label [Optional Text] | The Funds year-to-date return | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 9.09% | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 9.88% | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Mar. 31, 2024 | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (20.42%) | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns (for the period ended December 31, 2025) | ||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed | Effective March 31, 2026, the Fund changed its broad-based securities market index from the VettaFi US Equity 3000 Index to the Bloomberg US 3000 Total Return Index. | ||||||||||||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. | ||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts. | ||||||||||||||||||||||||||||||||||
| Performance [Table] |
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| Index No Deduction for Fees, Expenses, or Taxes [Text] | reflects no deduction for fees, expenses or taxes | ||||||||||||||||||||||||||||||||||
| Performance Table Closing [Text Block] | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts. |
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| Performance Availability Website Address [Text] | www.jamesinvestment.com | ||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | 1-800-99-JAMES (1-800-995-2637) | ||||||||||||||||||||||||||||||||||
| Retail Class [Member] | James Balanced: Golden Rainbow Fund | |||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart and performance table below illustrate the variability of the returns of the Retail Class shares of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Retail Class shares of the Fund from year to year and by showing how the average annual total returns of the Retail Class shares of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. Of course, the past performance of the Retail Class shares of the Fund is not necessarily an indication of how the Retail Class shares of the Fund will perform in the future. Updated performance information is available at no cost by visiting www.jamesinvestment.com or by calling 1-800-99-JAMES (1-800-995-2637).
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| Performance Past Does Not Indicate Future [Text] | Of course, the past performance of the Retail Class shares of the Fund is not necessarily an indication of how the Retail Class shares of the Fund will perform in the future. | ||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and performance table below illustrate the variability of the returns of the Retail Class shares of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Retail Class shares of the Fund from year to year and by showing how the average annual total returns of the Retail Class shares of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. | ||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Returns (Retail Class Shares) (Years ended December 31): | ||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The Funds Retail Class year-to-date return as of September 30, 2026 was 3.46%.
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| Year to Date Return, Label [Optional Text] | The Funds Retail Class year-to-date return | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 3.46% | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 7.16% | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2023 | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (9.98%) | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns (Retail Class Shares) (for the period ended December 31, 2025) | ||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed | Effective March 31, 2026, the Fund changed its broad-based securities market index from the VettaFi US Equity 3000 Index to the Bloomberg US 3000 Total Return Index. | ||||||||||||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts (IRA). | ||||||||||||||||||||||||||||||||||
| Performance [Table] |
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| Index No Deduction for Fees, Expenses, or Taxes [Text] | reflects no deduction for fees, expenses or taxes | ||||||||||||||||||||||||||||||||||
| Performance Table Closing [Text Block] | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts (IRA). |
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| Performance Availability Website Address [Text] | www.jamesinvestment.com | ||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | 1-800-99-JAMES (1-800-995-2637) | ||||||||||||||||||||||||||||||||||
| Institutional Class [Member] | James Balanced: Golden Rainbow Fund | |||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | The bar chart and performance table below illustrate the variability of the returns of the Institutional Class shares of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Institutional Class shares of the Fund from year to year and by showing how the average annual total returns of the Institutional Class shares of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. Of course, the past performance of the Institutional Class shares of the Fund is not necessarily an indication of how the Institutional Class shares of the Fund will perform in the future. Updated performance information is available at no cost by visiting www.jamesinvestment.com or by calling 1-800-99-JAMES (1-800-995-2637). |
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| Performance Past Does Not Indicate Future [Text] | Of course, the past performance of the Institutional Class shares of the Fund is not necessarily an indication of how the Institutional Class shares of the Fund will perform in the future. | ||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart and performance table below illustrate the variability of the returns of the Institutional Class shares of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the performance of the Institutional Class shares of the Fund from year to year and by showing how the average annual total returns of the Institutional Class shares of the Fund over time compare with the returns of a broad-based securities market index and an additional index that is more representative of the Funds strategy. | ||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Returns (Institutional Class Shares) (Years ended December 31): | ||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The Funds Institutional Class year-to-date return as of September 30, 2026 was 3.60%.
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| Year to Date Return, Label [Optional Text] | The Funds Institutional Class year-to-date return | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 3.60% | ||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Sep. 30, 2026 | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 7.25% | ||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2023 | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (9.90%) | ||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns (Institutional Class Shares) (for the period ended December 31, 2025) | ||||||||||||||||||||||||||||||||||
| Performance Table Market Index Changed | Effective March 31, 2026, the Fund changed its broad-based securities market index from the VettaFi US Equity 3000 Index to the Bloomberg US 3000 Total Return Index. | ||||||||||||||||||||||||||||||||||
| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. | ||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts (IRA). | ||||||||||||||||||||||||||||||||||
| Performance [Table] |
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| Index No Deduction for Fees, Expenses, or Taxes [Text] | reflects no deduction for fees, expenses or taxes | ||||||||||||||||||||||||||||||||||
| Performance Table Closing [Text Block] | After-tax returns are calculated using the historical highest individual federal marginal income tax rates for the character of income in question (as ordinary income or long-term capital gain) and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholders tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-qualified arrangements, such as 401(k) plans or individual retirement accounts (IRA). |
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| Performance Availability Website Address [Text] | www.jamesinvestment.com | ||||||||||||||||||||||||||||||||||
| Performance Availability Phone [Text] | 1-800-99-JAMES (1-800-995-2637) |