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Revenue - Contract costs (Details) - CAD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Capitalized Contract Cost [Line Items] |  |
Contract costs | $ 1,969,000 | $ 1,016,000
Fulfillment costs |  |
Capitalized Contract Cost [Line Items] |  |
Contract costs | 1,432,000 | 1,016,000
Reimbursable bid costs |  |
Capitalized Contract Cost [Line Items] |  |
Contract costs | 537,000 | 0
Fulfillment costs | $ 2,256,000 | $ 1,016,000

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- Definition Fulfillment Costs + References No definition available. + Details
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Namespace Prefix: | noa_
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Balance Type: | debit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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Period Type: | instant

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