XML 72 R53.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Interest expense (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Interest Expense [Abstract] |
Schedule of interest expense |
Year ended December 31, |  | 2018 |  |  | 2017 |
Interest on capital lease obligations |  | $ | 2,984 |  |  | $ | 3,023 |
Interest on credit facilities |  | 2,729 |  |  | 1,507 |
Interest on Convertible Debentures |  | 2,200 |  |  | 1,760 |
Interest on promissory notes |  | 202 |  |  | — |
Interest on mortgage |  | 105 |  |  | — |
Amortization of deferred financing costs (notes 10(c) and note 14(e)) |  | 539 |  |  | 797 |
Interest on long term debt |  | $ | 8,759 |  |  | $ | 7,087 |
Other interest income |  | (175 | ) |  | (144 | )
|  | $ | 8,584 |  |  | $ | 6,943 |
During the year ended December 31, 2018, $634 (December 31, 2017 - $nil) of interest was capitalized to property, plant and equipment in relation to a building construction in the year.

X
- Definition [Table Text Block] for Schedule of Interest Expense [Table] + References No definition available. + Details
Name: | noa_ScheduleOfInterestExpenseTableTextBlock
Namespace Prefix: | noa_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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