Document And Entity Information - shares
6 Months Ended
Dec. 31, 2019
Jan. 27, 2020
Document Information [Line Items]    
Entity Registrant Name KOSS CORP  
Entity Central Index Key 0000056701  
Trading Symbol koss  
Current Fiscal Year End Date --06-30  
Entity Filer Category Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding (in shares)   7,404,831
Entity Shell Company false  
Document Type 10-Q  
Document Period End Date Dec. 31, 2019  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q2  
Amendment Flag false  
Title of 12(b) Security Common Stock  
Entity Interactive Data Current Yes