Document and Entity Information Document - USD ($)
9 Months Ended
Mar. 31, 2019
May 06, 2019
Dec. 31, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name KOSS CORP    
Entity Central Index Key 0000056701    
Current Fiscal Year End Date --06-30    
Entity Filer Category Non-accelerated Filer    
Document Type 10-Q    
Document Period End Date Mar. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus Q3    
Amendment Flag false    
Entity Common Stock, Shares Outstanding   7,404,831  
Smaller Reporting Company true    
Emerging Growth Company false    
Entity Current Reporting Status Yes    
Entity Public Float     $ 8,010,893