Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 09, 2019
Document And Entity Information
Entity Registrant Name	NOCOPI TECHNOLOGIES INC/MD/
Entity Central Index Key	0000888981
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		58,616,716
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2019