Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2018
Accounting Policies [Abstract]
Basis of Accounting, Policy [Policy Text Block]	The unaudited interim financial statements as of and for the three months ended September 30, 2018 have been prepared by The L.S. Starrett Company (the “Company”) in accordance with accounting principles generally accepted in the United States of America for interim financial reporting. Accordingly, they do not include all of the information and notes required by generally accepted accounting principles for complete financial statements. These unaudited financial statements, which, in the opinion of management, reflect all adjustments (including normal recurring adjustments) necessary for a fair presentation, should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10 -K for the year ended June 30, 2018. Operating results are not necessarily indicative of the results that may be expected for any future interim period or for the entire fiscal year. The preparation of financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America requires management to make judgments, assumptions and estimates that affect amounts reported in the consolidated financial statements and accompanying notes. Note 2 to the Company’s Consolidated Financial Statements included in the Annual Report on Form 10 -K for the year ended June 30, 2018 describes the significant accounting policies and methods used in the preparation of the consolidated financial statements.
New Accounting Pronouncements, Policy [Policy Text Block]	Recent A ccounting Pronouncements In February 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") No. 2016 - 02, “Leases (Topic 842 )”. The ASU requires that organizations that lease assets recognize assets and liabilities on the balance sheet for the rights and obligations created by those leases. The ASU will affect the presentation of lease related expenses on the income statement and statement of cash flows and will increase the required disclosures related to leases. This ASU is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the impact of ASU No. 2016 - 02 on its consolidated financial statements. It is expected that a key change upon adoption will be the balance sheet recognition of leased assets and liabilities. In January 2017, the FASB issued ASU No. 2017 - 04, "Intangibles-Goodwill and Other (Topic 350 ): Simplifying the Test for Goodwill Impairment." Under the new guidance, if a reporting unit's carrying value amount exceeds its fair value, an entity will record an impairment charge based on that difference. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. The standard eliminates the requirement to calculate goodwill impairment using Step 2, which calculates an impairment charge by comparing the implied fair value of goodwill with its carrying amount. The standard does not change the guidance on completing Step 1 of the goodwill impairment test. The amendments in this ASU are effective for annual and interim periods beginning after December 15, 2019 and should be applied prospectively for annual and any interim goodwill impairment tests. Early adoption is permitted for entities for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The Company is currently evaluating the impact of the update on our consolidated financial statements. In February 2018, the FASB issued ASU No. 2018 - 02, “Income Statement – Reporting Comprehensive Income (Topic 220 ): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income”. For deferred tax items recognized in Accumulated Other Comprehensive Income (AOCI), changes in tax rates can leave amounts “stranded” in AOCI. Under ASU 2018 - 02, FASB has given companies an option to reclassify the stranded tax effects resulting from the tax law and tax rate changes under the Tax Cuts and Jobs Act of 2017 from AOCI to retained earnings. This guidance is effective for fiscal years beginning after December 15, 2018 and requires companies to disclosure whether they are or are not opting to reclassify the income tax effects from the new 2017 tax act. Early adoption is permitted. The Company is currently evaluating the impact of this update on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018 - 13, "Fair Value Measurement ('Topic 820' ): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement." The ASU modifies the disclosure requirements in Topic 820, Fair Value Measurement, by removing certain disclosure requirements related to the fair value hierarchy, modifying existing disclosure requirements related to measurement uncertainty and adding new disclosure requirements, such as disclosing the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period and disclosing the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. This ASU is effective for public companies for annual reporting periods and interim periods within those annual periods beginning after December 15, 2019. The Company is currently evaluating the effect, if any, that ASU 2018 - 13 will have on its consolidated financial statements. In August 2018, the FASB issued ASU No. 2018 - 14, "Compensation - Retirement Benefits - Defined Benefit Plans - General (Subtopic 715 - 20 ): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans." ASU 2018 - 14 removes certain disclosures that are not considered cost beneficial, clarifies certain required disclosures and added additional disclosures. This ASU is effective for public companies for annual reporting periods and interim periods within those annual periods beginning after December 15, 2020. The amendments in ASU 2018 - 14 must be applied on a retrospective basis. The Company is currently assessing the effect, if any, that ASU 2018 - 14 will have on its consolidated financial statements.