| 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. |
