v3.23.1
Cover - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 13, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2022    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2022    
Current Fiscal Year End Date --12-31    
Entity File Number 000-20333    
Entity Registrant Name Nocopi Technologies, Inc.    
Entity Central Index Key 0000888981    
Entity Tax Identification Number 87-0406496    
Entity Incorporation, State or Country Code MD    
Entity Address, Address Line One 480 Shoemaker Road    
Entity Address, Address Line Two Suite 104    
Entity Address, City or Town King of Prussia    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 19406    
City Area Code 610    
Local Phone Number 834-9600    
Title of 12(g) Security Common Stock, Par Value $0.01    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 9,574,000
Entity Common Stock, Shares Outstanding   9,251,178  
Auditor Name Morison Cogen LLP    
Auditor Firm ID 536    
Auditor Location Blue Bell, Pennsylvania