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Note 8 - Loan Payable (Details Textual) $ in Millions			12 Months Ended
	Jun. 14, 2019 USD ($)	Jan. 20, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020	Mar. 18, 2019 USD ($)
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 240.0
Debt Issuance Costs, Gross			$ 0.4
Debt Instrument, Term (Year)	4 years
Maximum Total Funded Debt to EBITDA Ratio				3.50
Minimum Fixed Charge Coverage Ratio				3
Percentage of Forecasted Capital Expenditures, Threshold for Annual Capital Expenditures				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			$ 0.1
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Guaranteed Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 180.0
Royal Bank, Bank of Montreal, Bank of Nova Scotia, HSBC and CIBC [Member] | Accordion Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 60.0
Fees to Lenders			0.3
Legal Fees			$ 0.2
Bank of Montreal and Royal Bank of Canada [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 140.0
Debt Issuance Costs, Gross					$ 0.2
Debt Instrument, Term (Year)		4 years

X

- Definition

Amount of fees to lenders incurred during the period.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

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X

- Definition

The minimum fixed charge coverage ratio.

+ References

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X

- Definition

Represents the threshold for annual capital expenditures as a percentage of forecasted capital expenditure.

+ References

No definition available.

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X

- Definition

Ratio of total funded debt to EDITDA.

+ References

No definition available.

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X

- 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.

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X

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

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- Definition

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

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X

- 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://fasb.org/us-gaap/role/ref/legacyRef
-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=120391452&loc=d3e13212-122682

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X

- Definition

The cash outflow for loan and debt issuance costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

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