v3.7.0.1
Document And Entity Information - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Aug. 26, 2017
Dec. 30, 2016
Document Information [Line Items]      
Entity Registrant Name COLLECTORS UNIVERSE INC    
Entity Central Index Key 0001089143    
Trading Symbol clct    
Current Fiscal Year End Date --06-30    
Entity Filer Category Accelerated Filer    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding (in shares)   8,920,998  
Entity Public Float     $ 159
Document Type 10-K    
Document Period End Date Jun. 30, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Amendment Flag false