Cover - shares	6 Months Ended
	Sep. 30, 2023	Nov. 13, 2023
Cover [Abstract]
Entity Registrant Name	FCCC, Inc.
Entity Central Index Key	0000730669
Document Type	10-Q
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Small Business	true
Entity Shell Company	false
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Document Period End Date	Sep. 30, 2023
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2024
Entity Common Stock Shares Outstanding		3,461,022
Entity File Number	001-08589
Entity Incorporation State Country Code	NV
Entity Tax Identification Number	06-0759497
Entity Address Address Line 1	40 Wall St
Entity Address Address Line 2	Floor 60
Entity Address City Or Town	New York City
Entity Address State Or Province	NY
Entity Address Postal Zip Code	10005
City Area Code	812
Local Phone Number	933-8888
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes