Document and Entity Information (USD $)
 12 Months Ended
Jun. 30, 2012
Sep. 13, 2012
Dec. 31, 2011
Document and Entity Information [Abstract]      
Entity Registrant Name THERMOGENESIS CORP    
Entity Central Index Key 0000811212    
Current Fiscal Year End Date --06-30    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Smaller Reporting Company    
Entity Public Float     $ 11,539,000
Entity Common Stock, Shares Outstanding   16,518,193  
Document Fiscal Year Focus 2012    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jun. 30, 2012