You can find additional information about the Fund at https://nsinvest.com/mutual-funds/bond-fund/. You can also request this information by contacting us at 1-855-580-0900.

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/bond-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$74	1.48%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 74

Expense Ratio, Percent

1.48%

^[1]

AssetsNet

$ 36,427,244

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 152,282

InvestmentCompanyPortfolioTurnover

27.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$36,427,244
Number of Portfolio Holdings	36
Advisory Fee	$152,282
Portfolio Turnover	27%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Convertible Bonds	1.3%
Corporate Bonds	82.7%
Money Market Funds	2.8%
Preferred Stocks	13.2%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Other Assets in Excess of Liabilities	1.7%
Money Market Funds	2.7%
Energy	4.2%
Industrials	5.1%
Consumer Staples	6.5%
Health Care	6.8%
Real Estate	8.1%
Financials	18.1%
Consumer Discretionary	46.8%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
Oceaneering International, Inc., 6.000%, 02/01/28	4.2%
Scotts Miracle-Gro Company (The), 5.250%, 12/15/26	4.1%
Under Armour, Inc., 3.250%, 06/15/26	4.1%
Beazer Homes USA, Inc., 5.875%, 10/15/27	4.1%
Wintrust Financial Corporation, 4.850%, 06/06/29	4.1%
Elanco Animal Health, Inc., 6.400%, 08/28/28	4.0%
Churchill Downs, Inc., 4.750%, 01/15/28	3.9%
Vail Resorts, Inc., 5.625%, 07/15/30	3.9%
EPR Properties, 4.950%, 04/15/28	3.8%
ACCO Brands Corporation, 4.250%, 03/15/29	3.8%

Material Fund Change [Text Block]

Material Fund Changes

No material changes occurred during the period ended May 31, 2026.

C000125620

Shareholder Report [Line Items]

Fund Name

North Star Dividend Fund

Class Name

Class I

Trading Symbol

NSDVX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about North Star Dividend Fund for the period of December 1, 2025 to May 31, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at https://nsinvest.com/mutual-funds/dividend-fund/. You can also request this information by contacting us at 1-855-580-0900.

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/dividend-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$75	1.39%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 75

Expense Ratio, Percent

1.39%

^[2]

AssetsNet

$ 97,567,128

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 454,578

InvestmentCompanyPortfolioTurnover

20.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$97,567,128
Number of Portfolio Holdings	61
Advisory Fee	$454,578
Portfolio Turnover	20%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Common Stocks	95.2%
Money Market Funds	3.9%
Preferred Stocks	0.9%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Other Assets in Excess of Liabilities	0.2%
Communications	1.0%
Technology	1.5%
Money Market Funds	3.9%
Industrials	4.9%
Consumer Staples	5.9%
Materials	6.3%
Energy	6.4%
Real Estate	8.2%
Utilities	18.5%
Financials	19.5%
Consumer Discretionary	23.7%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
Postal Realty Trust, Inc., Class A	4.0%
First American Treasury Obligations Fund, Class X	3.9%
Oil-Dri Corporation of America	3.6%
Select Water Solutions, Inc., Class A	3.5%
Sprott, Inc.	3.3%
Escalade, Inc.	2.7%
Northwestern Energy Group, Inc.	2.8%
Bar Harbor Bankshares	2.7%
Westwood Holdings Group, Inc.	2.5%
GATX Corporation	2.4%

Material Fund Change [Text Block]

Material Fund Changes

No material changes occurred during the period ended May 31, 2026.

C000125617

Shareholder Report [Line Items]

Fund Name

North Star Micro Cap Fund

Class Name

Class I

Trading Symbol

NSMVX

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/micro-cap-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$65	1.23%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 65

Expense Ratio, Percent

1.23%

^[3]

AssetsNet

$ 184,133,888

Holdings Count | Holding

105

Advisory Fees Paid, Amount

$ 711,222

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$184,133,888
Number of Portfolio Holdings	105
Advisory Fee	$711,222
Portfolio Turnover	18%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Common Stocks	98.1%
Money Market Funds	1.9%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Communications	1.1%
Utilities	1.3%
Money Market Funds	1.9%
Health Care	2.3%
Energy	2.4%
Consumer Staples	3.0%
Real Estate	3.9%
Financials	8.3%
Technology	8.4%
Materials	8.8%
Industrials	28.5%
Consumer Discretionary	30.1%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
Lincoln Educational Services Corporation	2.8%
Lindblad Expeditions Holdings, Inc.	2.4%
Green Brick Partners, Inc.	2.4%
Blue Bird Corporation	2.2%
QEP Company, Inc.	2.2%
Escalade, Inc.	2.2%
Barrett Business Services, Inc.	2.1%
Liquidity Services, Inc.	2.1%
Postal Realty Trust, Inc., Class A	2.0%
United States Lime & Minerals, Inc.	1.9%

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes to the Fund since December 1, 2025. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by March 31, 2027 at https://nsinvest.com/mutual-funds/micro-cap-fund/ or upon request at 1-855-580-0900.

On February 27, 2026, the North Star Micro Cap Fund acquired the assets and certain liabilities of the Perritt MicroCap Opportunities Fund (the “Acquired Fund”), pursuant to a plan of reorganization, approved by the Board of Trustees of the Trust, of both the Acquired Fund and the North Star Micro Cap Fund.

C000106068

Shareholder Report [Line Items]

Fund Name

North Star Opportunity Fund

Class Name

Class A

Trading Symbol

NSOPX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about North Star Opportunity Fund for the period of December 1, 2025 to May 31, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at https://nsinvest.com/mutual-funds/opportunity-fund/. You can also request this information by contacting us at 1-855-580-0900.

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/opportunity-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class A	$82	1.55%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 82

Expense Ratio, Percent

1.55%

^[4]

AssetsNet

$ 148,081,103

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 635,808

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$148,081,103
Number of Portfolio Holdings	69
Advisory Fee (net of waivers)	$635,808
Portfolio Turnover	22%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Common Stocks	71.2%
Convertible Bonds	1.6%
Corporate Bonds	17.5%
Money Market Funds	1.3%
Preferred Stocks	5.0%
U.S. Government & Agencies	3.4%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Other Assets in Excess of Liabilities	0.2%
Materials	0.9%
Money Market Funds	1.3%
Consumer Staples	3.2%
U.S. Treasury Obligations	3.3%
Communications	4.0%
Health Care	5.3%
Energy	5.8%
Industrials	5.9%
Real Estate	7.5%
Financials	17.7%
Technology	20.7%
Consumer Discretionary	24.2%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
Advanced Micro Devices, Inc.	4.9%
QUALCOMM, Inc.	4.1%
Alphabet, Inc., Class A	4.0%
Amazon.com, Inc.	3.7%
Apple, Inc.	3.6%
Bank of America Corporation	3.2%
Madison Square Garden Entertainment Corporation	3.1%
JPMorgan Chase & Company	3.0%
Blackstone, Inc.	3.0%
Sphere Entertainment Company	2.9%

Material Fund Change [Text Block]

Material Fund Changes

No material changes occurred during the period ended May 31, 2026.

C000106067

Shareholder Report [Line Items]

Fund Name

North Star Opportunity Fund

Class Name

Class I

Trading Symbol

NSOIX

Annual or Semi-Annual Statement [Text Block]

This semi-annual shareholder report contains important information about North Star Opportunity Fund for the period of December 1, 2025 to May 31, 2026.

Additional Information [Text Block]

You can find additional information about the Fund at https://nsinvest.com/mutual-funds/opportunity-fund/. You can also request this information by contacting us at 1-855-580-0900.

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/opportunity-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Class I	$69	1.30%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 69

Expense Ratio, Percent

1.30%

^[5]

AssetsNet

$ 148,081,103

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 635,808

InvestmentCompanyPortfolioTurnover

22.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$148,081,103
Number of Portfolio Holdings	69
Advisory Fee (net of waivers)	$635,808
Portfolio Turnover	22%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Common Stocks	71.2%
Convertible Bonds	1.6%
Corporate Bonds	17.5%
Money Market Funds	1.3%
Preferred Stocks	5.0%
U.S. Government & Agencies	3.4%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Other Assets in Excess of Liabilities	0.2%
Materials	0.9%
Money Market Funds	1.3%
Consumer Staples	3.2%
U.S. Treasury Obligations	3.3%
Communications	4.0%
Health Care	5.3%
Energy	5.8%
Industrials	5.9%
Real Estate	7.5%
Financials	17.7%
Technology	20.7%
Consumer Discretionary	24.2%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
Advanced Micro Devices, Inc.	4.9%
QUALCOMM, Inc.	4.1%
Alphabet, Inc., Class A	4.0%
Amazon.com, Inc.	3.7%
Apple, Inc.	3.6%
Bank of America Corporation	3.2%
Madison Square Garden Entertainment Corporation	3.1%
JPMorgan Chase & Company	3.0%
Blackstone, Inc.	3.0%
Sphere Entertainment Company	2.9%

Material Fund Change [Text Block]

Material Fund Changes

No material changes occurred during the period ended May 31, 2026.

C000241411

Shareholder Report [Line Items]

Fund Name

North Star Small Cap Value Fund

Class Name

Institutional Class

Trading Symbol

WFICX

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/small-cap-value-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Institutional Class	$63	1.14%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 63

Expense Ratio, Percent

1.14%

^[6]

AssetsNet

$ 33,970,675

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 74,904

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$33,970,675
Number of Portfolio Holdings	50
Advisory Fee (net of waivers)	$74,904
Portfolio Turnover	18%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Common Stocks	92.6%
Money Market Funds	7.4%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Liabilities in Excess of Other Assets	-1.4%
Utilities	1.0%
Materials	1.7%
Energy	2.2%
Communications	2.7%
Consumer Staples	4.3%
Real Estate	6.0%
Money Market Funds	7.5%
Technology	12.5%
Financials	16.1%
Consumer Discretionary	18.5%
Industrials	28.9%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
First American Treasury Obligations Fund, Class X	7.5%
Postal Realty Trust, Inc., Class A	3.7%
Allient, Inc.	3.7%
Comfort Systems USA, Inc.	3.6%
Blue Bird Corporation	3.6%
AZZ, Inc.	3.6%
Sphere Entertainment Company	3.5%
WisdomTree, Inc.	3.4%
V2X, Inc.	3.2%
Sprott, Inc.	3.2%

Material Fund Change [Text Block]

Material Fund Changes

This is a summary of certain changes to the Fund since December 1, 2025. For more complete information, you may review the Fund’s prospectus dated March 30, 2026, which is available at https://nsinvest.com/mutual-funds/small-cap-value-fund/ or upon request at 1-855-580-0900.

Effective April 1, 2026, the Fund increased its operating expense limitation from 0.98% to 1.51% of the average daily net assets for the Institutional Class and from 1.21% to 1.76% of the average daily net assets for the Investor Class.

Effective April 1, 2026, the Fund's annual Advisory fee rate was updated from 1.00% of the average daily net assets to 1.00% on the first $100 million in net assets and 0.90% thereafter.

C000241410

Shareholder Report [Line Items]

Fund Name

North Star Small Cap Value Fund

Class Name

Investor Class

Trading Symbol

WSCVX

Additional Information Phone Number

1-855-580-0900

Additional Information Website

https://nsinvest.com/mutual-funds/small-cap-value-fund/

Expenses [Text Block]

What were the Fund’s costs for the last six months?

(based on a hypothetical $10,000 investment)

Table Summary
Class Name	Costs of a $10,000 investment	Costs paid as a percentage of a $10,000 investment
Investor Class	$78	1.41%^{Footnote Reference*}

Footnote	Description
Footnote^*	Annualized

Expenses Paid, Amount

$ 78

Expense Ratio, Percent

1.41%

^[7]

AssetsNet

$ 33,970,675

Holdings Count | Holding

Advisory Fees Paid, Amount

$ 74,904

InvestmentCompanyPortfolioTurnover

18.00%

Additional Fund Statistics [Text Block]

Fund Statistics

Table Summary
Net Assets	$33,970,675
Number of Portfolio Holdings	50
Advisory Fee (net of waivers)	$74,904
Portfolio Turnover	18%

Holdings [Text Block]

Asset Weighting (% of total investments)

Table Summary
Value	Value
Common Stocks	92.6%
Money Market Funds	7.4%

Sector Weighting (% of net assets)

Table Summary
Value	Value
Liabilities in Excess of Other Assets	-1.4%
Utilities	1.0%
Materials	1.7%
Energy	2.2%
Communications	2.7%
Consumer Staples	4.3%
Real Estate	6.0%
Money Market Funds	7.5%
Technology	12.5%
Financials	16.1%
Consumer Discretionary	18.5%
Industrials	28.9%

Largest Holdings [Text Block]

Top 10 Holdings (% of net assets)

Table Summary
Holding Name	% of Net Assets
First American Treasury Obligations Fund, Class X	7.5%
Postal Realty Trust, Inc., Class A	3.7%
Allient, Inc.	3.7%
Comfort Systems USA, Inc.	3.6%
Blue Bird Corporation	3.6%
AZZ, Inc.	3.6%
Sphere Entertainment Company	3.5%
WisdomTree, Inc.	3.4%
V2X, Inc.	3.2%
Sprott, Inc.	3.2%

Material Fund Change [Text Block]

Material Fund Changes

Effective April 1, 2026, the Fund's annual Advisory fee rate was updated from 1.00% of the average daily net assets to 1.00% on the first $100 million in net assets and 0.90% thereafter.

[1]	Annualized
[2]	Annualized
[3]	Annualized
[4]	Annualized
[5]	Annualized
[6]	Annualized
[7]	Annualized