Shareholder Fees	Dec. 31, 2025
Oberweis International Opportunities Fund \| Investor Class
Prospectus [Line Items]
Redemption Fee (as a percentage of Amount Redeemed)	(2.00%)
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Oberweis International Opportunities Fund \| Institutional Class
Prospectus [Line Items]
Redemption Fee (as a percentage of Amount Redeemed)	(2.00%)
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Oberweis China Opportunities Fund \| Investor Class
Prospectus [Line Items]
Redemption Fee (as a percentage of Amount Redeemed)	(2.00%)
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Oberweis China Opportunities Fund \| Institutional Class
Prospectus [Line Items]
Redemption Fee (as a percentage of Amount Redeemed)	(2.00%)
Exchange Fee (as a percentage of Amount Redeemed)	2.00%
Oberweis Focused International Growth Fund \| Institutional Class
Prospectus [Line Items]
Redemption Fee (as a percentage of Amount Redeemed)	(2.00%)
Exchange Fee (as a percentage of Amount Redeemed)	2.00%