v3.26.1
Expense Example
Dec. 31, 2025
USD ($)
Oberweis Global Opportunities Fund | Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 147
Expense Example, with Redemption, 3 Years 456
Expense Example, with Redemption, 5 Years 787
Expense Example, with Redemption, 10 Years 1,724
Oberweis Global Opportunities Fund | Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 121
Expense Example, with Redemption, 3 Years 378
Expense Example, with Redemption, 5 Years 654
Expense Example, with Redemption, 10 Years 1,443
Oberweis Micro-Cap Fund | Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 149
Expense Example, with Redemption, 3 Years 462
Expense Example, with Redemption, 5 Years 797
Expense Example, with Redemption, 10 Years 1,746
Oberweis Micro-Cap Fund | Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 123
Expense Example, with Redemption, 3 Years 384
Expense Example, with Redemption, 5 Years 665
Expense Example, with Redemption, 10 Years 1,466
Oberweis Small-Cap Opportunities Fund | Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 127
Expense Example, with Redemption, 3 Years 399
Expense Example, with Redemption, 5 Years 691
Expense Example, with Redemption, 10 Years 1,522
Oberweis Small-Cap Opportunities Fund | Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 102
Expense Example, with Redemption, 3 Years 321
Expense Example, with Redemption, 5 Years 557
Expense Example, with Redemption, 10 Years 1,235
Oberweis International Opportunities Fund | Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 137
Expense Example, with Redemption, 3 Years 445
Expense Example, with Redemption, 5 Years 774
Expense Example, with Redemption, 10 Years 1,706
Oberweis International Opportunities Fund | Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 112
Expense Example, with Redemption, 3 Years 367
Expense Example, with Redemption, 5 Years 641
Expense Example, with Redemption, 10 Years 1,425
Oberweis China Opportunities Fund | Investor Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 183
Expense Example, with Redemption, 3 Years 573
Expense Example, with Redemption, 5 Years 988
Expense Example, with Redemption, 10 Years 2,145
Oberweis China Opportunities Fund | Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 158
Expense Example, with Redemption, 3 Years 496
Expense Example, with Redemption, 5 Years 858
Expense Example, with Redemption, 10 Years 1,876
Oberweis Focused International Growth Fund | Institutional Class  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 83
Expense Example, with Redemption, 3 Years 466
Expense Example, with Redemption, 5 Years 874
Expense Example, with Redemption, 10 Years $ 2,014