v3.26.1
Average Annual Total Returns
 12 Months Ended 60 Months Ended 103 Months Ended 120 Months Ended 129 Months Ended 225 Months Ended 363 Months Ended 465 Months Ended
Mar. 30, 2026
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
Dec. 31, 2025
 [7]
Dec. 31, 2025
 [5]
Dec. 31, 2025
Dec. 31, 2025
Saturna Growth Fund | Bloomberg US Large Cap Total Return Index (reflects no deduction for fees, expenses, or taxes)                  
Prospectus [Line Items]                  
Average Annual Return, Percent [1]   18.03% 14.00% 14.79% 14.93%        
Performance Inception Date Jun. 02, 2017                
Saturna Growth Fund | Bloomberg 1000 Growth Total Return Index (reflects no deduction for fees, expenses, or taxes)                  
Prospectus [Line Items]                  
Average Annual Return, Percent [1]   17.93% 13.60% 16.72% 16.60%        
Performance Inception Date Jun. 02, 2017                
Saturna Growth Fund | Investor Shares                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   15.99% 11.22%   13.99%       9.71%
Performance Inception Date Apr. 01, 1987                
Saturna Growth Fund | Investor Shares | After Taxes on Distributions                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   15.53% 10.38%   13.10%       9.17%
Performance Inception Date Apr. 01, 1987                
Saturna Growth Fund | Investor Shares | After Taxes on Distributions and Sales                  
Prospectus [Line Items]                  
Average Annual Return, Percent [2]   9.77% 8.49%   11.06%       7.58%
Performance Inception Date Apr. 01, 1987                
Saturna Growth Fund | Z Shares                  
Prospectus [Line Items]                  
Average Annual Return, Percent [1]   16.26% 11.49% 15.17%          
Performance Inception Date Jun. 02, 2017                
Saturna International Fund | Bloomberg Developed Markets ex-US Large & Mid Cap Total Return Index (reflects no deduction for fees, expenses, or taxes)                  
Prospectus [Line Items]                  
Average Annual Return, Percent [3]   32.46% 10.15% 8.59% 9.14%        
Performance Inception Date Jun. 02, 2017                
Saturna International Fund | Investor Shares                  
Prospectus [Line Items]                  
Average Annual Return, Percent [4]   22.50% 7.08%   10.25%     7.70%  
Performance Inception Date Sep. 28, 1995                
Saturna International Fund | Investor Shares | After Taxes on Distributions                  
Prospectus [Line Items]                  
Average Annual Return, Percent [4]   18.35% 5.92%   9.15%     7.13%  
Performance Inception Date Sep. 28, 1995                
Saturna International Fund | Investor Shares | After Taxes on Distributions and Sales                  
Prospectus [Line Items]                  
Average Annual Return, Percent [4]   14.50% 5.39%   8.44%     6.68%  
Performance Inception Date Sep. 28, 1995                
Saturna International Fund | Z Shares                  
Prospectus [Line Items]                  
Average Annual Return, Percent [3]   22.86% 7.32% 9.79%          
Performance Inception Date Jun. 02, 2017                
Saturna Core Fund | Bloomberg Developed Markets Large & Mid Cap Total Return Index (reflects no deduction for fees, expenses, or taxes)                  
Prospectus [Line Items]                  
Average Annual Return, Percent   21.47% 12.56%   12.66%   8.32%    
Performance Inception Date Mar. 30, 2007                
Saturna Core Fund | Bloomberg Global Equity/Fixed Income 60/40 Index (reflects no deduction for fees, expenses, or taxes)                  
Prospectus [Line Items]                  
Average Annual Return, Percent [6]   16.10% 6.60%   8.19%   4.09%    
Performance Inception Date Mar. 30, 2007                
Saturna Core Fund | Saturna Core Fund Shares                  
Prospectus [Line Items]                  
Average Annual Return, Percent   14.18% 6.71%   7.63%   5.67%    
Performance Inception Date Mar. 30, 2007                
Saturna Core Fund | Saturna Core Fund Shares | After Taxes on Distributions                  
Prospectus [Line Items]                  
Average Annual Return, Percent   13.31% 5.94%   6.99%   5.06%    
Performance Inception Date Mar. 30, 2007                
Saturna Core Fund | Saturna Core Fund Shares | After Taxes on Distributions and Sales                  
Prospectus [Line Items]                  
Average Annual Return, Percent   8.49% 4.91%   5.85%   4.22%    
Performance Inception Date Mar. 30, 2007                
Saturna Global Sustainable Bond Fund | Bloomberg Global Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes)                  
Prospectus [Line Items]                  
Average Annual Return, Percent   8.17% (2.15%)   1.26% 1.02%      
Performance Inception Date Mar. 27, 2015                
Saturna Global Sustainable Bond Fund | Saturna Global Sustainable Bond Fund Shares                  
Prospectus [Line Items]                  
Average Annual Return, Percent   10.10% 0.96%   2.28% 1.93%      
Performance Inception Date Mar. 27, 2015                
Saturna Global Sustainable Bond Fund | Saturna Global Sustainable Bond Fund Shares | After Taxes on Distributions                  
Prospectus [Line Items]                  
Average Annual Return, Percent   8.41% (0.10%)   1.25% 0.92%      
Performance Inception Date Mar. 27, 2015                
Saturna Global Sustainable Bond Fund | Saturna Global Sustainable Bond Fund Shares | After Taxes on Distributions and Sales                  
Prospectus [Line Items]                  
Average Annual Return, Percent   5.89% 0.22%   1.20% 0.93%      
Performance Inception Date Mar. 27, 2015                
[1] Saturna Growth Fund Z Shares began operations June 2, 2017, and the Life of Fund return for the, Bloomberg US Large Cap Total Return Index and Bloomberg 1000 Growth Total Return Index is shown since this date.
[2] Saturna Growth Fund Investor Shares began operations April 1, 1987.
[3] Saturna International Fund Z Shares began operations June 2, 2017, and the Life of Fund return for the Bloomberg Developed Markets ex-US Large & Mid Cap Total Return Index is shown since this date.
[4] Saturna International Fund Investor Shares began operations September 28, 1995.
[5] Saturna Core Fund began operations March 30, 2007.
[6] Benchmark returns are not available because the life of the benchmark, since its inception, has not yet surpassed the periods indicated.
[7] Saturna Sustainable Bond Fund began operations March 27, 2015.