Cover - USD ($) $ in Millions	12 Months Ended
Cover - USD ($) $ in Millions	Dec. 31, 2025	Mar. 16, 2026	Jun. 30, 2025
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Amendment Description	FiEE, Inc. (the “Company,” “we,” “us” or “our”) is filing this Amendment No. 1 (this “Amendment”) to its Annual Report on Form 10-K for the fiscal year ended December 31, 2025, filed with the U.S. Securities and Exchange Commission (the “SEC”) on March 20, 2026 (the “Original Form 10-K”). This Amendment is being filed for the purpose of (i) restating Part I, Item 1 (Business) and Part I, Item 1A (Risk Factors) and (ii) including certain information required by Part III of Form 10-K. The Part III information was previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K, which permits such information to be incorporated by reference from the Company’s definitive proxy statement, provided such proxy statement is filed no later than 120 days after the end of the fiscal year. Pursuant to SEC rules, we have included as exhibits certifications dated as of the date of this Amendment required under Section 302 of the Sarbanes-Oxley Act of 2002 with paragraphs 3, 4, and 5 of the certifications omitted because no financial statements are included in this Amendment. Since no financial statements are included in this Amendment, we are not including certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. We are also amending Part IV, Item 15 to reflect the inclusion of such certifications. In addition, we have made certain revisions to the cover page, including deletion of the reference to our proxy statement. Except as expressly set forth herein, this Amendment does not amend, update, or modify the disclosures in, or exhibits to, the Original Form 10-K, or otherwise reflect events occurring after the filing date of the Original Form 10-K. Terms used but not defined herein have the meaning set forth in the Original Form 10-K.
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2025
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2025
Current Fiscal Year End Date	--12-31
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	0000
City Area Code	852
Local Phone Number	28166813
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	FIEE
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 6.0
Entity Common Stock, Shares Outstanding		7,934,122
ICFR Auditor Attestation Flag	false
Document Financial Statement Error Correction [Flag]	false

FiEE, Inc. 10-K/A