v3.26.3
Cover
Oct. 12, 2026
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 12, 2026
Entity File Number 001-37649
Entity Registrant Name FiEE, Inc.
Entity Central Index Key 0001467761
Entity Tax Identification Number 04-2621506
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 3-33
Entity Address, Address Line Two 2-chome Utajima
Entity Address, Address Line Three Nishiyodogawa District
Entity Address, City or Town Osaka
Entity Address, Country JP
Entity Address, Postal Zip Code 00000
City Area Code +81 6
Local Phone Number 7509 3700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.01 par value
Trading Symbol FIEE
Security Exchange Name NASDAQ
Entity Emerging Growth Company false