Saturna Growth Fund Investor Shares Z Shares Market risk Equity securities risk Investment strategy risk Liquidity risk Sector risk Large transaction risk Bloomberg US Large Cap Total Return Index (reflects no deduction for fees, expenses, or taxes) Bloomberg 1000 Growth Total Return Index (reflects no deduction for fees, expenses, or taxes) Saturna International Fund Investor Shares Z Shares Foreign investing risk Emerging markets risk Bloomberg Developed Markets ex-US Large & Mid Cap Total Return Index (reflects no deduction for fees, expenses, or taxes) Saturna Core Fund Saturna Core Fund Shares Interest Rate Risk [Member] Credit Risk [Member] Bloomberg Developed Markets Large & Mid Cap Total Return Index (reflects no deduction for fees, expenses, or taxes) Bloomberg Global Equity/Fixed Income 60/40 Index (reflects no deduction for fees, expenses, or taxes) Saturna Global Sustainable Bond Fund Saturna Global Sustainable Bond Fund Shares High yield risk Bloomberg Global Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) Investor Shares [Default Label] Z Shares [Default Label]