Cover - shares	6 Months Ended
	Sep. 30, 2021	Nov. 08, 2021
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, 2021
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Entity Common Stock Shares Outstanding		3,461,022
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes
Entity File Number	001-08589
Entity Incorporation State Country Code	CT
Entity Tax Identification Number	06-0759497
Entity Address Address Line 1	7700 Irvine Centre Dr
Entity Address Address Line 2	Suite 800
Entity Address City Or Town	Irvine
Entity Address State Or Province	CA
Entity Address Postal Zip Code	92618
City Area Code	812
Local Phone Number	933-8888