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Accounts Receivable (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Accounts Receivable (Textual) |  |
Recoveries collected for doubtful accounts | $ 795,914 | $ 10,018

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- References No definition available. + Details
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Namespace Prefix: | sgbx_
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Period Type: | duration

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- Definition Amount of increase in allowance for credit loss on accounts receivable, from recovery. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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Balance Type: | credit
Period Type: | duration