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Sale of Investment	12 Months Ended
	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Sale of Investment	Sale of Investment On September 16, 2015, we reduced our ownership to 15% in Kingstone Hong Kong. Our investment in Kingstone Hong Kong was accounted for using the equity method for periods subsequent to the deconsolidation due to our ability to exert significant influence over the financial and operating policies of Kingstone Hong Kong, primarily through our representation on the board of directors. We recognized our portion of net income or losses on a one-quarter lag. The resulting equity method investment was initially recorded at fair value at $2.7 million using the value the third party purchaser placed on their investment in Kingstone Shanghai, a Level 2 input in the fair value hierarchy. The carrying value of the equity method investment in Kingstone Hong Kong was $2.6 million as of September 30, 2017. Effective June 29, 2018, we sold our remaining 15% ownership interest in Kingstone Hong Kong to the majority owner for approximately $5.7 million, which was received in August 2018. We recognized a pre-tax gain of approximately $2.9 million, which is reported as gain on sale of other assets in our Consolidated Statements of Operations for the year ended September 30, 2018. Kingstone Hong Kong and its owner are no longer related parties of Amtech.

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- Definition

The entire disclosure for equity method investments and joint ventures. Equity method investments are investments that give the investor the ability to exercise significant influence over the operating and financial policies of an investee. Joint ventures are entities owned and operated by a small group of businesses as a separate and specific business or project for the mutual benefit of the members of the group.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-URI http://asc.fasb.org/topic&trid=2196965

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