S000023468 [Member] Investment Objectives and Goals - Sit Global Dividend Growth Fund	Jun. 30, 2026
Prospectus [Line Items]
Risk/Return [Heading]	SIT GLOBAL DIVIDEND GROWTH FUND
Objective [Heading]	INVESTMENT OBJECTIVE
Objective, Primary [Text Block]	The Sit Global Dividend Growth Fund (the “Fund”) seeks to provide current income that exceeds the dividend yield of the Fund’s benchmark index and that grows over a period of years.
Objective, Secondary [Text Block]	Secondarily, the Fund seeks long-term capital appreciation.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 2
-Subsection a

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 2
-Subsection a

Name:	oef_ObjectivePrimaryTextBlock
Namespace Prefix:	oef_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 2
-Subsection a

Name:	oef_ObjectiveSecondaryTextBlock
Namespace Prefix:	oef_
Data Type:	dtr-types:textBlockItemType
Balance Type:	na
Period Type:	duration

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Form N-1A
-Section 1
-Subsection a

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Section 2
-Name Form N-1A
-Subsection a

Name:	dei_LegalEntityAxis=smfi_S000023468Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: