Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2014	Mar. 16, 2015
Document and Entity Information [Abstract]
Entity Registrant Name	PROTEON THERAPEUTICS INC
Document Type	10-K
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		16,449,164
Entity Public Float		$ 85,338,141
Amendment Flag	false
Entity Central Index Key	0001359931
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Well-known Seasoned Issuer	No
Document Period End Date	Dec. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY