v3.8.0.1
Document And Entity Information - shares
3 Months Ended
Sep. 30, 2017
Oct. 31, 2017
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
Document Type 10-Q  
Document Period End Date Sep. 30, 2017  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q1  
Amendment Flag false