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Accounts Receivable, Net (Details 1) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Receivables [Abstract] |  |
Beginning balance | $ 1,815,927 | $ 741,187
Bad debt provision | 1,572,175 | 986,787
Foreign exchange translation | (159,370) | 87,953
Ending balance | $ 3,228,732 | $ 1,815,927

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- Definition Foreign exchange translation. + References No definition available. + Details
Name: | reto_ForeignExchangeTranslation
Namespace Prefix: | reto_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References No definition available. + Details
Name: | reto_ProvisionForDoubtfulAccount
Namespace Prefix: | reto_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AllowanceForDoubtfulAccountsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration