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Unearned Revenue (Details) - Schedule of unearned revenue includes customer deposits and deferred revenue - USD ($) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of unearned revenue includes customer deposits and deferred revenue [Abstract] |  |  |
Beginning Balance | $ 564,227 | $ 362,951 | $ 953,306
Revenue recognized | (27,075,116) | (37,752,173) | (30,316,831)
Amounts collected or invoiced | 27,131,731 | 37,953,449 | 29,726,476
Ending Balance | $ 620,842 | $ 564,227 | $ 362,951

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- Definition Amount of amounts collected or invoiced. + References No definition available. + Details
Name: | strn_AmountsCollectedOrInvoiced
Namespace Prefix: | strn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | strn_RevenueRecognized
Namespace Prefix: | strn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | strn_ScheduleOfUnearnedRevenueIncludesCustomerDepositsAndDeferredRevenueAbstract
Namespace Prefix: | strn_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(5)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DeferredRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant