v3.26.1
Cover Page - shares
3 Months Ended
Mar. 31, 2026
May 04, 2026
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Mar. 31, 2026  
Document Transition Report false  
Entity File Number 001-35944  
Entity Registrant Name POWER SOLUTIONS INTERNATIONAL, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-0963637  
Entity Address, Address Line One 201 Mittel Drive  
Entity Address, City or Town Wood Dale  
Entity Address, State or Province IL  
Entity Address, Postal Zip Code 60191  
City Area Code 630  
Local Phone Number 350-9400  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol PSIX  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   23,050,450
Entity Central Index Key 0001137091  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q1  
Amendment Flag false