Cover - shares	6 Months Ended
	Sep. 30, 2020	Nov. 12, 2020
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	true
Entity Emerging Growth Company	false
Entity Current Reporting Status	Yes
Document Period End Date	Sep. 30, 2020
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2021
Entity Common Stock Shares Outstanding		3,461,022
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes