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Deposits (Details Narrative) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Deposits	$ 23,420	$ 33,264
Lease Agreement Deposit [Member]
Deposits	$ 23,420	$ 33,264

X

- Definition

Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DepositsAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_BalanceSheetLocationAxis=FCUV_LeaseAgreementDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: