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Note 7 - Loan Payable (Details Textual) $ in Thousands			3 Months Ended			9 Months Ended
	Jun. 14, 2019 USD ($)	Jan. 20, 2017 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	[1]	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	[1]	Jun. 30, 2019 USD ($)	Mar. 18, 2019 USD ($)
Payments of Financing Costs, Total			$ (2)	$ 4		$ 639	$ 8
Foreign Exchange Risk [Member]
Line of Credit Facility, Maximum Borrowing Capacity									$ 2,017,000
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 240,000
Fees to Lenders	300
Legal Fees	200
Debt Issuance Costs, Gross	$ 400
Debt Instrument, Term	4 years
Maximum Total Funded Debt to EBITDA Ratio			3.5			3.5
Minimum Fixed Charge Coverage Ratio			3			3
Percentage of Forecasted Capital Expenditures, Threshold for Annual Capital Expenditures			110.00%			110.00%
Total Funded Debt to EBITDA Ratio			2			2
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | General and Administrative Expense [Member]
Payments of Financing Costs, Total	$ 100
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Guaranteed Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	180,000
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Accordion Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 60,000
Bank of Montreal and Royal Bank of Canada [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 140,000
Debt Issuance Costs, Gross										$ 200
Debt Instrument, Term		4 years
[1] The Company has initially applied ASC 2016-02 (Topic 842) using the modified retrospective method. Under this method, the comparative information is not restated.

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Amount of fees to lenders incurred during the period.

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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.

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-SubTopic 30
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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.

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