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Lease (Details Narrative) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Lease
Operating lease expense	$ 104,156	$ 280,311

X

- References

No definition available.

+ Details

Name:	FCUV_DisclosureLeaseAbstract
Namespace Prefix:	FCUV_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of operating lease expense. Excludes sublease income.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-4

+ Details

Name:	us-gaap_OperatingLeaseExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration