Cover - shares	3 Months Ended
	Jun. 30, 2024	Aug. 01, 2024
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	Jun. 30, 2024
Entity Filer Category	Non-accelerated Filer
Document Fiscal Period Focus	Q1
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	17800 Castleton St
Entity Address Address Line 2	Suite 695
Entity Address City Or Town	City Of Industry
Entity Address State Or Province	CA
Entity Address Postal Zip Code	91748
City Area Code	812
Local Phone Number	933-8888
Document Quarterly Report	true
Document Transition Report	false
Entity Interactive Data Current	Yes