## Idaho Tax-Exempt  Fund

**Ticker Symbol: NITEX**

**March 27, 2015**

### SUMMARY PROSPECTUS

*Before you invest, you may want to review Idaho Tax-Exempt Fund's prospectus, which contains more information about the Fund and its risks. You can find the Fund's **prospectus** and other information about the Fund, including the **statement of additional information** and most recent reports to shareowners, online at www.idahotaxexemptfund.com/prospectus. You can also get this information at no cost by calling 1-800-728-8762 or by sending an email request to info@saturna.com. The Fund's prospectus and statement of additional information, both dated March 27, 2015, are incorporated by reference into this Summary Prospectus.*

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| Idaho Tax-Exempt Fund | NITEX |
|-----------------------|-------|

### Investment Objective

Idaho Tax-Exempt Fund seeks to provide income free from federal income, federal alternative minimum, and Idaho state income taxes. Preservation of capital is a secondary objective.

### Fees and Expenses

Shareowner Fees

There are no fees that shareowners pay directly from their investments, such as charges for purchases, redemptions, and exchanges of shares.

| **Annual Fund Operating Expenses** (expenses that you pay each year as a  percentage of the value of your investment) |
|-----------------------------------------------------------------------------------------------------------------------|
| Management Fee                                                                                                        | 0.50% |
| Distribution (12b-1) Fees                                                                                             | None |
| Other Expenses                                                                                                        | 0.15% |
| Total Annual Fund Operating Expenses                                                                                  | 0.65% |

Example

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.

The Example assumes you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same. Although actual costs may be higher or lower, based on these assumptions, your costs would be:

| 1 Year | 3 Years | 5 Years | 10 Years |
|--------|---------|---------|----------|
| $66    | $208    | $362    | $810     |

Portfolio Turnover

The Fund may pay transaction costs, such as commissions and a bid-ask-spread, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 4.69% of the average value of its portfolio.

### Principal Investment Strategies

Idaho Tax-Exempt Fund invests in debt securities issued by the State of Idaho and its political subdivisions. These municipal bonds, notes, and commercial paper may be in various forms, including general obligation bonds, revenue bonds, mortgage bonds, certificates of participation, local improvement district bonds, and refunding bonds.

The Fund buys investment grade bonds, meaning those rated "Baa" or higher by a national bond rating agency (e.g., Moody's Investor's Services), or, if unrated, of equivalent quality in the opinion of the adviser, considered at the time of purchase. At least 40% of bonds that the Fund buys must be rated "A" or higher or, if unrated, of equivalent quality, on a similar basis. Factors used in bond evaluations include such information as the bond district's financial position, population size, employment trends, economic activity, and diversification. The portfolio's dollar-weighted average effective maturity is expected to range between 6 and 15 years. In accordance with the fundamental investment policies of the Fund, under normal circumstances, at least 80% of assets are invested in debt securities generating income exempt from both federal and Idaho income tax.

### Principal Risks of Investing

The value of Fund shares rises and falls as the value of the securities in which the Fund invests goes up and down. Only consider investing in the Fund if you are willing to accept the risk that you may lose money. Fund share prices, yields, and total returns will change with fluctuations in the securities markets as well as the fortunes of the industries and municipalities in which the Fund invests.

Idaho Tax-Exempt Fund risks depend primarily on the terms and quality of the obligations in the Fund's portfolio as well as on market conditions. When interest rates rise, bond prices fall. When interest rates fall, bond prices go up. Bonds with longer maturities, such as those held by the Fund, usually are more sensitive to interest rate changes than bonds with shorter maturities.

The Fund entails credit risk, which is the possibility that a bond will not be able to pay interest or principal when due. If the credit quality of a bond is perceived to decline, investors will demand a higher yield, which means a lower price on that bond to compensate for the higher level of risk. If a security held by the Fund defaults on payment of interest or principal, the Fund's income, ability to preserve capital, and liquidity would all be adversely affected.

Fund investments are susceptible to factors adversely affecting Idaho, such as political, economic, and financial trends unique to this state. Industries important to Idaho's economy include services, government, construction, food and agricultural production, and electronics. Investing only in Idaho bonds means that the Fund's investments are more concentrated than other mutual funds, and relatively few bond price changes may lead to underperformance compared to investments selected in greater number and/or from a wider universe.

The Fund is vulnerable to income tax rate changes, either at the Idaho or federal level, since part of municipal securities' value is derived from the recipient's ability to exclude interest payments from taxation.

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| Idaho Tax-Exempt Fund | NITEX |
|-----------------------|-------|

### Performance

The following bar chart and table provide an indication of the risks of investing in the Idaho Tax-Exempt Fund by showing performance from year to year and by showing how the Fund's average annual returns for 1, 5, and 10 years compare to those of a broad-based market index. 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.idahotaxexemptfund.com.

Annual Total Return

| Best Quarter  | Q1 2009 | 4.79%  |
|---------------|---------|--------|
| Worst Quarter | Q3 2008 | -3.97% |

| **Average Annual Total Returns**for periods ended December 31, 2014               |
|-----------------------------------------------------------------------------------|
|                                                                              | 1 Year | 5 Year | 10 Year |
| Return before taxes                                                               | 6.80% | 3.62% | 3.61% |
| Return after taxes on distributions                                               | 6.78% | 3.61% | 3.60% |
| Return after taxes on distributions and sale of Fund shares                       | 5.10% | 3.29% | 3.08% |
| S&P Idaho Municipal Index (reflects no deduction for fees, expenses or taxes) | 9.65% | 5.79% | 5.19% |

After-tax returns are calculated using the historical highest individual federal marginal income tax rates but do not reflect the impact of any state or local taxes. Actual after-tax returns depend on an investor's tax situation and likely differ from those shown. After-tax illustrations are not relevant to retirement plans, corporations, trusts, or other investors that are taxed at special rates.

### Investment Adviser

Saturna Capital Corporation is Idaho Tax-Exempt Fund's investment adviser.

### Portfolio Manager

Mr. Phelps McIlvaine, a vice president of Saturna Capital Corporation, is the person primarily responsible for the day-to-day management of the Idaho Tax-Exempt Fund, which he has managed since 1995. Mr. Patrick Drum MBA, CFA, a portfolio manager and fixed income analyst of Saturna Capital Corporation, is the deputy portfolio manager, which role he assumed in 2015.

### Purchase and Sale of Fund Shares

You may open an account and purchase shares by sending a completed application, a photocopy of a government-issued identity document, and a check for $1,000 or more ($100 under a group or retirement plan) payable to the Idaho Tax-Exempt Fund. Shareowners may purchase additional shares at any time in minimum amounts of $25.

Shareowners may redeem shares on any business day by several methods:

Written request

> 
Write:   Idaho Tax-Exempt Fund             Box N            Bellingham, WA 98227-0596

Or Fax:   360-734-0755

Telephone request

> 
Call:   800-728-8762 or 360-734-9900

### Tax Information

Dividends paid from investments in Idaho bonds are not subject to federal or Idaho state income taxes, including the federal alternative minimum income tax. Any ordinary income dividends or capital gain distributions you receive from the Fund may be subject to federal, state, and local income taxes.

### Financial Intermediary Compensation

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your salesperson to recommend the Fund over another investment. Ask your salesperson or visit your financial intermediary's website for more information.

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