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Note 8 - Loan Payable (Details Textual) $ in Thousands		3 Months Ended			6 Months Ended
	Jan. 20, 2017 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	[1]	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	[1]	Mar. 18, 2019 USD ($)
Payments of Financing Costs, Total		$ 434			$ 641	$ 4
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member]
Line of Credit Facility, Maximum Borrowing Capacity		240,000			240,000
Legal Fees					200
Debt Issuance Costs, Gross		$ 400			400
Payments of Financing Costs, Total					$ 300
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			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			$ 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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- Definition

Ratio of total funded debt to EDITDA that triggers obligation to repay 50% of excess cash flow as defined under the credit agreement.

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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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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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