Bank indebtedness (Narrative) (Details) - 3 months ended Mar. 31, 2019 $ in Thousands, $ in Thousands	USD ($)	CAD ($)
Line of Credit Facility, Interest Rate Description	Bank's prime lending rate plus 2%.
Line of Credit Facility, Collateral	The credit facility and term loan (see note 8) are secured by a first ranking movable hypothec on all present and future movable property of the Company for an amount of CAD$4,250,000 ($3,180,000) plus 20%, and a 50% guarantee by Export Development Canada, a Canadian Crown corporation export credit agency.
Line Of Credit Facility, Collateral Amount	$ 3,180,000	$ 4,250,000
Line Of Credit Facility, Collateral Percentage	20.00%
Line Of Credit Facility, Guarantee Percentage By Export Development Canada	50.00%
Line of Credit [Member]
Long-term Line of Credit	$ 187	250
Corporate Credit Cards [Member]
Long-term Line of Credit	56	75
Foreign Exchange Contract [Member]
Long-term Line of Credit	$ 318	$ 425

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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