Document and Entity Information - USD ($)	12 Months Ended
	Jun. 30, 2020	Nov. 10, 2020	Dec. 31, 2019
Cover [Abstract]
Document Type	10-K/A
Amendment Flag	true
Document Period End Date	Jun. 30, 2020
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2020
Entity Registrant Name	PERCEPTRON INC/MI
Entity Central Index Key	0000887226
Current Fiscal Year End Date	--06-30
Entity Filer Category	Non-accelerated Filer
Entity Shell Company	false
Trading Symbol	PRCP
Title of 12(b) Security	Common Stock, $0.01 par value
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Public Float			$ 53,000,000
Entity Common Stock, Shares Outstanding		9,779,547
Entity File Number	0-20206
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Tax Identification Number	38-2381442
Entity Address, Address Line One	47827 Halyard Drive
Entity Address, City or Town	Plymouth
Entity Address, State or Province	MI
Entity Incorporation, State or Country Code	MI
Entity Address, Postal Zip Code	48170-2461
City Area Code	734
Local Phone Number	414-6100
Document Annual Report	true
Document Transition Report	false
Amendment Description	Perceptron, Inc. (the “Company”) is filing this Amendment No. 2 on Form 10-K/A (this “Amendment No. 2”) to its Annual Report on Form 10-K for the fiscal year ended June 30, 2020, filed with the Securities and Exchange Commission (the “SEC”) on September 28, 2020, as amended by that certain Amendment No. 1 to Annual Report on Form 10-K/A, filed with the SEC on November 3, 2020 to amend certain information regarding the beneficial ownership by the Company’s directors and executive officers. Pursuant to Rule 12b-15 under the Exchange Act, this Amendment No. 2 also contains new certifications by the principal executive officer and the principal financial officer as required by Section 302 of the Sarbanes-Oxley Act of 2002. Accordingly, Item 15(a)(3) of Part IV is amended to include the currently dated certifications as exhibits.