The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Name:	us-gaap_AmortizationOfIntangibleAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Intangible Assets, Net (Details Textual)	12 Months Ended
Intangible Assets, Net (Details Textual)	Dec. 31, 2018 USD ($) m²	Dec. 31, 2017 USD ($) m²	Dec. 31, 2016 USD ($)	Dec. 31, 2015 m²
Intangible Assets, Net (Textual)
Land use right \| m²				206,667
Amortization expense \| $	$ 166,850	$ 163,154	$ 175,784
Short-term Debt [Member]
Intangible Assets, Net (Textual)
Land use right \| m²	26,695
Land, amount carrying value \| $	$ 400,000
Long-term Debt [Member]
Intangible Assets, Net (Textual)
Land use right \| m²	306,000	306,000
Land, amount carrying value \| $	$ 4,900,000	$ 5,300,000