Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Mar. 15, 2017	Jun. 30, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	NOCOPI TECHNOLOGIES INC/MD/
Entity Central Index Key	0000888981
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Document Type	10-K
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Public Float			$ 709,000
Entity Common Stock Shares Outstanding		58,599,016
Entity Well Known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes