Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 08, 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	Sep. 30, 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 Shell Company	false
Entity Common Stock, Shares Outstanding		60,324,698
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Incorporation State Country Name	MD
Entity File Number	000-20333