Summary of Significant Accounting Policies (Details - Concentration of risk) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Product Information [Line Items]
Revenue	$ 47,973	$ 190,255
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer A [Member]
Product Information [Line Items]
Revenue	$ 0	$ 101,831
Concentration risk percentage	0.00%	54.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer B [Member]
Product Information [Line Items]
Revenue		$ 50,597
Concentration risk percentage		27.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer C [Member]
Product Information [Line Items]
Revenue	$ 0	$ 19,966
Concentration risk percentage	0.00%	10.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer D [Member]
Product Information [Line Items]
Revenue	$ 28,000	$ 0
Concentration risk percentage	58.00%	0.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer E [Member]
Product Information [Line Items]
Revenue	$ 8,822	$ 0
Concentration risk percentage	18.00%	0.00%
Revenue Benchmark [Member] \| Customer Concentration Risk [Member] \| Customer F [Member]
Product Information [Line Items]
Revenue	$ 5,650	$ 0
Concentration risk percentage	12.00%	0.00%
Accounts Payable [Member] \| Customer Concentration Risk [Member] \| Customer A [Member]
Product Information [Line Items]
Revenue	$ 0		$ 7,125
Concentration risk percentage	0.00%		100.00%
Accounts Payable [Member] \| Customer Concentration Risk [Member] \| Customer D [Member]
Product Information [Line Items]
Revenue	$ 4,000		$ 0
Concentration risk percentage	41.00%		0.00%
Accounts Payable [Member] \| Customer Concentration Risk [Member] \| Customer F [Member]
Product Information [Line Items]
Revenue	$ 5,650		$ 0
Concentration risk percentage	59.00%		0.00%

FOCUS UNIVERSAL INC. 10-Q