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CONSOLIDATED STATEMENTS OF CASH FLOWS | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Cash flows (used in) from operating activities |  |
Profit (loss) for the year | $ 1,491,606 | $ (56,830,610)
Items not involving cash: |  |
Depreciation | 1,533,634 | 758,063
Share-based payments | 13,736,299 | 9,183,667
Amortization of deferred lease inducement | (40,097) | (40,096)
Impairment of exploration and evaluation assets |  | 87,749
Unrealized foreign exchange gain on cash and cash equivalents | (3,905,624) | (258,399)
Deferred income tax recovery | (309,298) | (33,312)
Mark to market loss (gain) on convertible debentures | (32,578,261) | 27,522,985
Interest expense | 11,954,146 | 8,693,847
Loss on disposal of equipment | 6,065 | 24,905
Changes in non-cash working capital items: |  |
Amounts receivable | 161,130 | 259,378
Prepaid expenses | (107,478) | (86,300)
Deposits | (481,784) | (10,075)
Accounts payable and accrued liabilities | 87,594 | (416,299)
Net cash flows from (used in) operating activities | (8,452,068) | (11,144,497)
Cash flows (used in) from investing activities |  |
Exploration and evaluation asset expenditures | (34,813,614) | (35,960,842)
Acquisition of equipment | (2,954,028) | (1,859,729)
Sale and maturity of short-term investments |  | 47,455,100
Net cash flows from (used in) investing activities | (37,767,642) | 9,634,529
Cash flows (used in) from financing activities |  |
Cash from exercise of options and warrants, net of share issuance costs | 5,074,334 | 3,985,175
Shares issued for cash from private placements, net of share issuance costs |  | 60,225,368
Shares of subsidiary issued to non-controlling interests for cash, net of share issuance costs | 5,273,624 | 1,017,249
Interest paid on convertible debentures | (7,918,533) | (5,416,686)
Shares issued in connection with issuance of convertible debentures |  | 2,258,820
Issuance of convertible debentures |  | 73,035,180
Net cash flows from (used in) financing activities | 2,429,425 | 135,105,106
Change in cash and cash equivalents | (43,790,285) | 133,595,138
Cash and cash equivalents, beginning of year | 164,943,850 | 31,090,313
Effect of exchange rate fluctuations on cash held | 3,905,624 | 258,399
Cash and cash equivalents | 125,059,189 | 164,943,850
Cash and cash equivalents consist of: |  |
Cash | 125,059,189 | 153,329,808
Cash equivalents |  | 11,614,042
Cash and cash equivalents | $ 125,059,189 | $ 164,943,850

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- Definition Adjustments for deferred tax expense to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Deferred tax expense (income); Profit (loss)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Paragraph 20 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_20&doctype=Standard -URIDate 2018-03-16 + Details
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Period Type: | duration

X
- Definition Cash from exercise of options and warrants, net of share issuance costs + References No definition available. + Details
Name: | nxe_ProceedsFromExerciseOfOptionsAndWarrants
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from issuance of convertible debentures. + References No definition available. + Details
Name: | nxe_ProceedsFromIssuanceOfConvertibleDebentures
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Proceeds from shares issued in connection with issuance of convertible debentures. + References No definition available. + Details
Name: | nxe_ProceedsFromSharesIssuedInConnectionWithIssuanceOfConvertibleDebentures
Namespace Prefix: | nxe_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration