XML 107 R29.htm IDEA: XBRL DOCUMENT
v3.25.3

Summary of Significant Accounting Policies (Details - Foreign Currency Translation) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
China, Yuan Renminbi |  |  |
DisclosureLineElements [Line Items] |  |  |
Average rate | 7.2197 | 7.1843 |
Exchange rate | 7.198 |  | 7.2975
United States of America, Dollars |  |  |
DisclosureLineElements [Line Items] |  |  |
Average rate | 1.0000 | 1.0000 |
Exchange rate | 1.0000 |  | 1.0000

X
- References No definition available. + Details
Name: | FCUV_DisclosureLineElements
Namespace Prefix: | FCUV_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | FCUV_ForeignCurrencyExchangeRateTranslation2
Namespace Prefix: | FCUV_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479424/830-30-S99-1 + Details
Name: | us-gaap_ForeignCurrencyExchangeRateTranslation1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_CurrencyAxis=currency_CNY
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |