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Credit facilities (Narrative) (Details) | Oct. 03, 2016 USD ($) | Mar. 30, 2017 USD ($) | Feb. 11, 2016 USD ($) | Aug. 07, 2013 USD ($) | Aug. 07, 2013 CAD ($)
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RCM Credit Agreement [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Aggregate principal amount of notes |  |  |  | $ 6,400,000 |
Remaining principal portion of notes |  | $ 5,600,000 |  |  |
Interest rate |  |  |  | 12.00% | 12.00%
RCM Credit Agreement [Member] | Canadian Dollar [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Aggregate principal amount of notes |  |  |  |  | $ 8,500,000
Subordinated Secured Credit Facility [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Aggregate principal amount of notes |  |  | $ 2,900,000 |  |
Remaining principal portion of notes |  |  | $ 1,600,000 |  |
Interest rate |  |  | 10.00% |  |
Repayment of principal of subordinated facility | $ 1,300,000 |  |  |  |

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