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Long term debt - Credit facility (Details) |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 26, 2016 CAD | Apr. 29, 2016 CAD | Jun. 30, 2017 CAD | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD | Mar. 31, 2017 | Sep. 30, 2016 CAD | Apr. 27, 2016 CAD | Apr. 04, 2016 CAD | Apr. 03, 2016 CAD | Jul. 08, 2015 CAD | Apr. 07, 2010
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Less: current portion |  |  |  | CAD (8,246,000) | CAD (5,962,000) |  |  |  |  |  |  |
Long-term debt, gross, non-current |  |  |  | 31,326,000 | 22,610,000 |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  |  |  |  |  |  |  | CAD 90,000,000.0 | CAD 75,000,000.0 | CAD 100,000,000 |
Required scheduled payment |  |  |  | 5,962,000 | CAD 6,964,000 |  |  |  |  |  |  |
Repurchase amount |  |  |  |  |  |  |  |  | CAD 10,000,000 |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  |  |  |  |  |  |  |  |  | 30,000,000 |
Amortization schedule for repayment |  |  |  |  | 84 months |  |  |  |  |  |  |
Debt covenant, prepayment annual amount |  |  |  | 4,000,000 |  |  |  |  |  |  |  |
Required scheduled payment |  | CAD 1,700,000 |  |  |  |  |  |  |  |  |  |
Drawdown against revolver | CAD 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Long-term debt unpaid balance |  |  |  | 28,600,000 | CAD 28,600,000 |  |  |  |  |  |  |
Debentures |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, gross, non-current |  |  |  |  | 19,927,000 |  | CAD 0 |  |  |  |  |
Redeemed debentures | CAD 10,000,000 |  |  |  |  |  | CAD 10,000,000 | CAD 9,927,000 |  |  |  |
Revolver |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity of credit facility |  |  |  |  |  |  |  |  |  |  | CAD 70,000,000 |
Amount outstanding during period |  |  |  | 800,000 | 2,400,000 |  |  |  |  |  |  |
Borrowing base |  |  |  | 92,100,000 |  |  |  |  |  |  |  |
Unused borrowing availability under the revolving facility |  |  |  | CAD 58,200,000 | 67,600,000 |  |  |  |  |  |  |
Maximum | Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Repayment percentage of excess cash flow |  |  |  | 25.00% |  |  |  |  |  |  |  |
Senior leverage ratio |  |  |  | 3.5 |  |  |  |  |  |  |  |
Fixed charge ratio |  |  |  | 1.0 |  |  |  |  |  |  |  |
Maximum | Revolver |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowing base |  |  |  |  | 83,800,000 |  |  |  |  |  |  |
Minimum | Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt covenant, threshold amount for prepayment |  |  |  | CAD 18,000,000 |  |  |  |  |  |  |  |
Senior leverage ratio |  |  |  | 3.0 |  |  |  |  |  |  |  |
Minimum | Revolver |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Borrowing base |  |  |  | CAD 51,700,000 | 52,800,000 |  |  |  |  |  |  |
Credit facility |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Credit Facility |  |  |  | 39,572,000 | 28,572,000 |  |  |  |  |  |  |
Less: current portion |  |  |  | (8,246,000) | (5,962,000) |  |  |  |  |  |  |
Long-term debt, gross, non-current |  |  |  | 31,326,000 | 22,610,000 |  |  |  |  |  |  |
Credit facility | Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Credit Facility |  |  |  | 28,572,000 | 28,572,000 |  |  |  |  |  |  |
Credit facility | Revolver |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total Credit Facility |  |  |  | CAD 11,000,000 | 0 |  |  |  |  |  |  |
Series 1 Debentures | Debentures |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redeemed debentures |  |  |  |  | CAD 38,800,000 |  |  |  |  |  |  |
Stated interest rate on long term debt | 9.125% |  |  |  |  |  |  |  |  |  |  | 9.125%
Scenario, forecast | Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Required scheduled payment |  |  | CAD 4,000,000 |  |  |  |  |  |  |  |  |
Scenario, forecast | Minimum | Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed charge ratio |  |  |  |  |  | 0.9 |  |  |  |  |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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