Basis of Presentation	9 Months Ended
Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation In the opinion of management, the accompanying condensed consolidated financial statements include all adjustments necessary to present fairly the financial position, results of operations and cash flows of Acme United Corporation (the “Company”). These adjustments are of a normal, recurring nature. However, the financial statements do not include all of the disclosures normally required by accounting principles generally accepted in the United States of America or those normally made in the Company's Annual Report on Form 10-K. Please refer to the Company's Annual Report on Form 10-K for the year ended December 31, 2016 for such disclosures. The condensed consolidated balance sheet as of December 31, 2016 was derived from the audited consolidated balance sheet as of that date. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations and the financial statements and notes thereto included in the Company’s 2016 Annual Report on Form 10-K. The Company has evaluated events and transactions subsequent to September 30, 2017 and through the date these condensed consolidated financial statements were included in this Form 10-Q and filed with the SEC. Recently Issued and Adopted Accounting Standards In January 2017, the Financial Accounting Standards Board (FASB) issued Auditing Standards Update (ASU) No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. ASU 2017-04 simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Under the new amendments, an entity should perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. We adopted this guidance prospectively at the beginning of first quarter 2017 and it has not had a material impact on our financial statements. In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new guidance clarifies the definition of a business in order to allow for the evaluation of whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We do not expect that ASU 2017-01 will have a material impact on our financial statements. In March 2016, the FASB issued ASU 2016-09 to improve the accounting for employee share-based payments. This standard simplifies several aspects of the accounting for share-based payment award transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows, as part of FASB’s simplification initiative to reduce cost and complexity in accounting standards while maintaining or improving the usefulness of the information provided to the users of financial statements. The new standard was effective for the Company beginning on January 1, 2017. The adoption of the new standard resulted in the recognition of excess tax benefits in the amount of approximately $350,000 in our provision for income taxes within the Condensed Consolidated Statement of Operations for the nine months ended September 30, 2017, rather than additional paid-in capital. Additionally, our Condensed Consolidated Statement of Cash Flows now present excess tax benefits as an operating activity included in other accrued liabilities, adjusted prospectively. In February 2016, the FASB issued guidance that will change the requirements for accounting for leases. The principal change under the new accounting guidance is that lessees under leases classified as operating leases will recognize a right-of-use asset and a lease liability. Current lease accounting does not require lessees to recognize assets and liabilities arising under operating leases on the balance sheet. Under the new guidance, lessees (including lessees under leases classified as finance leases and operating leases) will recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Expense recognition and cash flow presentation guidance will be based upon whether the lease is classified as an operating lease or a finance lease (the classification criteria for distinguishing between finance leases and operating leases is substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current guidance). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition approach for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements; the guidance provides certain practical expedients. The Company will evaluate this guidance in 2018 to determine its impact on the Company’s results of operations, cash flows and financial position. In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. ASU 2014-09 supersedes most existing revenue recognition guidance in U.S. GAAP. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date (“ASU 2015-14”), which had the effect of deferring the effective date of ASU 2014-09 to March 1, 2018 for the Company. Early adoption of ASU 2014-09 became permitted in the first quarter of fiscal year 2017. The Company expects to adopt ASU 2014-09 in the first quarter of 2018. The guidance permits the use of either the retrospective or cumulative effect transition method. We have not yet selected a transition method, and we continue to evaluate the effect that the updated standard will have on our consolidated financial condition, results of operations and cash flows. We generally do not have significant customer contracts and do not provide post-delivery services. As such, adoption of the new guidance is not expected to result in a significant change in the amount of revenue recognized or the timing of when such revenue is recognized and accordingly we do not expect adoption of the guidance to have a material impact on our financial results.

Basis of Presentation

9 Months Ended

Sep. 30, 2017

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. Basis of Presentation

In the opinion of management, the accompanying condensed consolidated financial statements include all adjustments necessary to present fairly the financial position, results of operations and cash flows of Acme United Corporation (the “Company”). These adjustments are of a normal, recurring nature. However, the financial statements do not include all of the disclosures normally required by accounting principles generally accepted in the United States of America or those normally made in the Company's Annual Report on Form 10-K. Please refer to the Company's Annual Report on Form 10-K for the year ended December 31, 2016 for such disclosures. The condensed consolidated balance sheet as of December 31, 2016 was derived from the audited consolidated balance sheet as of that date. The results of operations for interim periods are not necessarily indicative of the results to be expected for the full year. The information included in this Quarterly Report on Form 10-Q should be read in conjunction with Management’s Discussion and Analysis of Financial Condition and Results of Operations and the financial statements and notes thereto included in the Company’s 2016 Annual Report on Form 10-K.

The Company has evaluated events and transactions subsequent to September 30, 2017 and through the date these condensed consolidated financial statements were included in this Form 10-Q and filed with the SEC.

Recently Issued and Adopted Accounting Standards

In January 2017, the Financial Accounting Standards Board (FASB) issued Auditing Standards Update (ASU) No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. ASU 2017-04 simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test. Under the new amendments, an entity should perform its annual or interim goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit's fair value. We adopted this guidance prospectively at the beginning of first quarter 2017 and it has not had a material impact on our financial statements.

In January 2017, the FASB issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The new guidance clarifies the definition of a business in order to allow for the evaluation of whether transactions should be accounted for as acquisitions or disposals of assets or businesses. The new guidance is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. We do not expect that ASU 2017-01 will have a material impact on our financial statements.

In March 2016, the FASB issued ASU 2016-09 to improve the accounting for employee share-based payments. This standard simplifies several aspects of the accounting for share-based payment award transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows, as part of FASB’s simplification initiative to reduce cost and complexity in accounting standards while maintaining or improving the usefulness of the information provided to the users of financial statements. The new standard was effective for the Company beginning on January 1, 2017. The adoption of the new standard resulted in the recognition of excess tax benefits in the amount of approximately $350,000 in our provision for income taxes within the Condensed Consolidated Statement of Operations for the nine months ended September 30, 2017, rather than additional paid-in capital. Additionally, our Condensed Consolidated Statement of Cash Flows now present excess tax benefits as an operating activity included in other accrued liabilities, adjusted prospectively.

In February 2016, the FASB issued guidance that will change the requirements for accounting for leases. The principal change under the new accounting guidance is that lessees under leases classified as operating leases will recognize a right-of-use asset and a lease liability. Current lease accounting does not require lessees to recognize assets and liabilities arising under operating leases on the balance sheet. Under the new guidance, lessees (including lessees under leases classified as finance leases and operating leases) will recognize a right-to-use asset and a lease liability on the balance sheet, initially measured as the present value of lease payments under the lease. Expense recognition and cash flow presentation guidance will be based upon whether the lease is classified as an operating lease or a finance lease (the classification criteria for distinguishing between finance leases and operating leases is substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current guidance). The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2018. Early adoption is permitted. The new standard must be adopted using a modified retrospective transition approach for capital and operating leases existing at, or entered into after, the beginning of the earliest comparative period presented in the financial statements; the guidance provides certain practical expedients. The Company will evaluate this guidance in 2018 to determine its impact on the Company’s results of operations, cash flows and financial position.

In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) (“ASU 2014-09”), which requires an entity to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which it expects to be entitled in exchange for those goods or services. ASU 2014-09 supersedes most existing revenue recognition guidance in U.S. GAAP. In August 2015, the FASB issued ASU No. 2015-14, Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date (“ASU 2015-14”), which had the effect of deferring the effective date of ASU 2014-09 to March 1, 2018 for the Company. Early adoption of ASU 2014-09 became permitted in the first quarter of fiscal year 2017. The Company expects to adopt ASU 2014-09 in the first quarter of 2018. The guidance permits the use of either the retrospective or cumulative effect transition method. We have not yet selected a transition method, and we continue to evaluate the effect that the updated standard will have on our consolidated financial condition, results of operations and cash flows. We generally do not have significant customer contracts and do not provide post-delivery services. As such, adoption of the new guidance is not expected to result in a significant change in the amount of revenue recognized or the timing of when such revenue is recognized and accordingly we do not expect adoption of the guidance to have a material impact on our financial results.