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Trade Accounts and Bills Payable (Narrative) (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
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Collateral Amount | $ 57,863,871 | $ 55,667,476
Bills receivable [Member] |  |
Collateral Amount | $ 9,427,448 | $ 19,047,471

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |