v3.19.1
Document And Entity Information - shares
9 Months Ended
Mar. 31, 2019
Apr. 30, 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)   9,148,286
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false