Performance Management |
May 31, 2026 |
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| Amana Income Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | Annual Total Return The following bar chart presents the calendar year total returns of the Fund’s Investor Shares before taxes. The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. Performance data current to the most recent month-end and quarter-end are available on www.saturna.com/resources/literature. |
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| Performance Past Does Not Indicate Future [Text] | A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The year-to-date return as of the most recent calendar quarter (which ended June 30, 2026) was 16.64%. |
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| Year to Date Return, Label [Optional Text] | year-to-date return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 16.64% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Jun. 30, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 18.47% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (18.01%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | The table below presents the average annual returns for the Fund and provides an indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1, 5, and 10 years and for the life of the Fund compare to those of a broad-based securities market index and an additional index with characteristics relevant to the Fund’s investment strategy. |
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| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local taxes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Explanation after Tax Higher | Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance [Table] |
1 Amana Income Fund Investor Shares began operations June 23, 1986. 2 Amana Income Fund Institutional Shares began operations September 25, 2013, and the Life of Fund return for the Bloomberg US Large Cap and Bloomberg 1000 Value Indexes is shown since this date. |
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| Performance Table One Class of after Tax Shown [Text] | After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 and do not reflect the impact of any state or local taxes. After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. |
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| Performance Availability Website Address [Text] | www.saturna.com/resources/literature | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amana Growth Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | Annual Total Return The following bar chart presents the calendar year total returns of the Fund’s Investor Shares before taxes. The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. Performance data current to the most recent month-end and quarter-end are available on www.saturna.com/resources/literature. |
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| Performance Past Does Not Indicate Future [Text] | A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The year-to-date return as of the most recent calendar quarter (which ended June 30, 2026) was 19.39%. |
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| Year to Date Return, Label [Optional Text] | year-to-date return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 19.39% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Jun. 30, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 22.63% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (14.52%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Jun. 30, 2022 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | The table below presents the average annual returns of the Fund and provides an indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1, 5, and 10 years compare to those of a broad-based securities market index and an additional index with characteristics relevant to the Fund’s investment strategy. |
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| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local taxes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Explanation after Tax Higher | Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance [Table] |
1 Amana Growth Fund Investor Shares began operations February 3, 1994. 2 Amana Growth Fund Institutional Shares began operations September 25, 2013, and the Life of Fund return for the Bloomberg US Large Cap and Bloomberg 1000 Growth Indexes is shown since this date. |
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| Performance Table One Class of after Tax Shown [Text] | After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 and do not reflect the impact of any state or local taxes. After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. |
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| Performance Availability Website Address [Text] | www.saturna.com/resources/literature | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amana Developing World Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | Annual Total Return The following bar chart presents the calendar year total returns of the Fund Investor Shares before taxes. The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. Performance data current to the most recent month-end and quarter-end are available on www.saturna.com/resources/literature. |
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| Performance Past Does Not Indicate Future [Text] | A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The year-to-date return as of the most recent calendar quarter (which ended June 30, 2026) was 13.13%. |
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| Year to Date Return, Label [Optional Text] | year-to-date return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 13.13% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Jun. 30, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 19.46% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Dec. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (17.50%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | The table below presents the average annual returns for the Fund and provides an indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for 1, 5, and 10 years and for the life of the Fund compare to those of a broad-based securities market index. |
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| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local taxes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Explanation after Tax Higher | Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance [Table] |
1 Amana Developing World Fund Investor Shares began operations September 28, 2009. 2 Amana Developing World Fund Institutional Shares began operations September 25, 2013, and the Life of Fund return for the Bloomberg Emerging Markets Large, Mid & Small Index is shown since this date. |
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| Performance Table One Class of after Tax Shown [Text] | After-tax returns illustrated are only for the Fund’s Investor Shares; after-tax returns for Institutional Shares will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 and do not reflect the impact of any state or local taxes. After-tax returns illustrated are only for the Fund’s Investor Shares; after-tax returns for Institutional Shares will vary. Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. |
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| Performance Availability Website Address [Text] | www.saturna.com/resources/literature | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Amana Participation Fund | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Prospectus [Line Items] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart and Performance Table [Heading] | Performance | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Narrative [Text Block] | Annual Total Return The following bar chart presents the calendar year total returns of the Fund Institutional Shares before taxes (Institutional Shares are used for this chart because they represent the largest share class of the Fund). The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. Performance data current to the most recent month-end and quarter-end are available on www.saturna.com/resources/literature. |
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| Performance Past Does Not Indicate Future [Text] | A fund’s past performance (before and after taxes) is not a guarantee of how a fund will perform in the future. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Information Illustrates Variability of Returns [Text] | The bar chart provides an indication of the risks of investing in the Fund by showing changes in performance from year to year. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Heading] | Annual Total Return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart [Table] |
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| Bar Chart Closing [Text Block] |
The year-to-date return as of the most recent calendar quarter (which ended June 30, 2026) was 2.00%. |
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| Year to Date Return, Label [Optional Text] | year-to-date return | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return | 2.00% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Bar Chart, Year to Date Return, Date | Jun. 30, 2026 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Label [Optional Text] | Best Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return | 5.50% | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Highest Quarterly Return, Date | Jun. 30, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Label [Optional Text] | Worst Quarter | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return | (3.44%) | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Lowest Quarterly Return, Date | Mar. 31, 2020 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Heading | Average Annual Total Returns | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Narrative | The table below presents the average annual returns of the Participation Fund and provides an indication of the risks of investing in the Fund by showing how the Fund’s average annual returns for the previous 1 and 5 years and since the Fund’s inception on September 28, 2015, compare to those of a broad-based securities market index and an additional index with characteristics relevant to the Fund’s investment strategy. |
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| Performance Table Uses Highest Federal Rate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of any state or local taxes. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Not Relevant to Tax Deferred | Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance Table Explanation after Tax Higher | Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Performance [Table] |
1 Amana Participation Fund began operations September 28, 2015. |
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| Performance Table One Class of after Tax Shown [Text] | After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| 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 and do not reflect the impact of any state or local taxes. After-tax returns illustrated are only for the Investor Shares; after-tax returns for Institutional Shares will vary. Actual after-tax returns depend on an investor’s tax situation and likely differ from those illustrated. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates. Return after taxes on distributions and sale of Fund shares may be higher than other returns for the same period due to a tax benefit of realizing a capital loss upon the sale of Fund shares. |
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| Performance Availability Website Address [Text] | www.saturna.com/resources/literature | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||