Prospectus: Document [Axis] Prospectus Coregistrant [Axis] Coregistrant [Domain] Series [Axis] Series Share Class [Axis] Share Classes Prospectus [Line Items] Risk/Return: Document Type Document Period End Date Registrant Name Entity Central Index Key Central Index Key Amendment Flag Document Creation Date Document Effective Date Prospectus Date Entity Inv Company Type S000004772 [Member] AMANA INCOME FUND C000012979 [Member] Income Fund Investor Shares C000131513 [Member] Income Fund Institutional Shares Performance Measure [Axis] Before Taxes After Taxes on Distributions Return after taxes on distributions After Taxes on Distributions and Sales Return after taxes on distributions and sale of Fund shares S P 500 Index reflects no deduction for fees expenses or taxes [Member] S&P 500 Index (reflects no deduction for fees, expenses, or taxes) Risk/Return [Heading] Objective [Heading] Objective, Primary [Text Block] Expense [Heading] Expense Narrative [Text Block] Shareholder Fees Caption [Text] Shareholder Fees [Table] Operating Expenses Caption [Text] Annual Fund Operating Expenses [Table] Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example, With Redemption [Table] Expense Example, No Redemption [Table] Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Strategy [Heading] Strategy Narrative [Text Block] Risk [Heading] Risk Narrative [Text Block] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Bar Chart [Heading] Bar Chart [Table] Bar Chart Closing [Text Block] Performance Table Heading Performance Table Heading Performance Table Narrative Performance Table Narrative Performance [Table] Performance Table Closing [Text Block] S000050991 [Member] Amana Participation Fund C000160666 [Member] Participation Fund Investor Shares C000160667 [Member] Participation Fund Institutional Shares FTSE Sukuk Index [Member] FTSE Sukuk Index (reflects no deduction for fees, expenses, or taxes) FTSE Sukuk Index[member]. S000026568 [Member] Amana Developing World Fund C000079787 [Member] Developing World Fund Investor Shares C000131515 [Member] Developing World Fund Institutional Shares MSCI Emerging Markets Index [Member] MSCI Emerging Markets Index (reflects no deduction for fees, expenses, or taxes) MSCI Emerging Markets Index[member]. S000022508 [Member] Amana Growth Fund C000065109 [Member] Growth Fund Investor Shares C000131514 [Member] Growth Fund Institutional Shares Shareholder Fees: Shareholder Fee, Other Shareowner Fees Operating Expenses: Management Fees (as a percentage of Assets) Management Fees Distribution and Service (12b-1) Fees Distribution (12b-1) Fees Other Expenses (as a percentage of Assets): Other Expenses Other Expenses Expenses (as a percentage of Assets) Total Annual Fund Operating Expenses Total Annual Fund Operating Expenses Expense Example: Expense Example, with Redemption, 1 Year 1 Year Expense Example, with Redemption, 3 Years 3 Years Expense Example, with Redemption, 5 Years 5 Years Expense Example, with Redemption, 10 Years 10 Years Bar Chart Table: Annual Return 2010 2010 Annual Return 2011 2011 Annual Return 2012 2012 Annual Return 2013 2013 Annual Return 2014 2014 Annual Return 2015 2015 Annual Return 2016 2016 Annual Return 2017 2017 Annual Return 2018 2018 Annual Return 2019 2019 Average Annual Return: Label Label 1 Year 1 Year 5 Years 5 Years 10 Years 10 Years Since Inception Life of Fund Inception Date Inception Date Objective, Secondary [Text Block] Portfolio Turnover, Rate Portfolio Turnover, Rate Risk Lose Money [Text] Risk Nondiversified Status [Text] Performance Information Illustrates Variability of Returns [Text] Performance Availability Website Address [Text] Performance Past Does Not Indicate Future [Text] Year to Date Return, Label Bar Chart, Year to Date Return, Date Bar Chart, Year to Date Return Highest Quarterly Return, Label Highest Quarterly Return, Date Highest Quarterly Return Lowest Quarterly Return, Label Lowest Quarterly Return, Date Lowest Quarterly Return Performance Table Uses Highest Federal Rate Performance Table Not Relevant to Tax Deferred Performance Table One Class of after Tax Shown [Text] Average Annual Return, Caption Caption