Entity Information (USD $)	6 Months Ended
	Jun. 30, 2011
Entity Registrant Name	GSE SYSTEMS INC
Entity Central Index Key	0000944480
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float	$ 41,231,808
Entity Common Stock, Shares Outstanding	19,088,800
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2