Wire fee Overnight check delivery fee Retirement account fees (annual maintenance fee) Shareholder service fees All other expenses Riverbridge Growth Fund Investor Class Institutional Class Market risk [Member] Equity risk [Member] Growth-oriented investment strategies risk [Member] Sector focus risk [Member] Small-cap and mid-cap company risk [Member] Management and strategy risk [Member] Foreign investment risk [Member] Issuer risk [Member] Preferred stock risk [Member] Convertible securities risk [Member] Recent market events [Member] Cybersecurity risk [Member] S&P 500 Index (Reflects No Deductions for Fees, Expenses or Taxes) Russell 3000 Growth Index (Reflects No Deductions for Fees, Expenses or Taxes) Overnight Check Delivery Fee Cybersecurity Risk Member Preferred Stock Risk Member Retirement Account Fees C000121984 Member Foreign Investment Risk Member Market Risk Member Convertible Securities Risk Member S000039554 Member Equity Risk Member index_ Russell_3000_ Growth_ Index_ Reflects_ No_ Deductions_for_ Fees_ Expenses_or_ Taxes Member Management And Strategy Risk Member Growthoriented Investment Strategies Risk Member Sector Focus Risk Member Recent Market Events Member index_ SP_500_ Index_ Reflects_ No_ Deductions_for_ Fees_ Expenses_or_ Taxes Member Issuer Risk Member Wire Fee C000121983 Member Smallcap And Midcap Company Risk Member