v3.10.0.1
Document And Entity Information - shares
6 Months Ended
Dec. 31, 2018
Jan. 31, 2019
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 Non-accelerated Filer  
Entity Current Reporting Status Yes  
Entity Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding (in shares)   9,121,451
Document Type 10-Q  
Document Period End Date Dec. 31, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Amendment Flag false