v3.6.0.2
Document And Entity Information - shares
6 Months Ended
Dec. 31, 2016
Jan. 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 Dec. 31, 2016  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Amendment Flag false