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Note 8 - Loan Payable (Details Textual) CAD in Millions		4 Months Ended	9 Months Ended	12 Months Ended
	Jan. 20, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 01, 2018	Sep. 30, 2018	Dec. 31, 2017 CAD	Dec. 05, 2017 USD ($)	Jan. 19, 2017 USD ($)
Payments of Financing Costs	$ 600,000			$ 620,217	$ 513,665
Foreign Exchange Risk [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 3,500,000
Line of Credit Facility Covenant Period				1 year 180 days
Bank of Montreal and Royal Bank of Canada [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 140,000,000
Debt Instrument, Term	4 years
Maximum Total Funded Debt to EBITDA Ratio	2.25	3	3
Repayment Obligation, Percentage of Excess Cash Flow	50.00%
Minimum Fixed Charge Coverage Ratio		1.2	1.2
Maximum Annual Capital Expenditures Requirement			$ 32,800,000
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling			$ 20,000,000
Maximum Ratio of Funded Share Repurchases to 12 Months Trailing EDITDA		1.5	1.5
Bank of Montreal and Royal Bank of Canada [Member] | Scenario, Forecast [Member]
Maximum Total Funded Debt to EBITDA Ratio							2.25	2.5
Bank of Montreal and Royal Bank of Canada [Member] | Total Loans Do Not Exceed 1.5 Times of Trailing 12 Months EBITDA [Member]
Line of Credit Facility, Maximum Funded Share Repurchases Ceiling			$ 40,000,000
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility C [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 35,500,000										$ 40,000,000
Line of Credit Facility, Increase in Maximum Borrowing Capacity		$ 502,500
Bank of Montreal and Royal Bank of Canada [Member] | Non-revolving Facility D [Member]
Line of Credit Facility, Maximum Borrowing Capacity	84,500,000
Long-term Line of Credit	84,500,000
Bank of Montreal and Royal Bank of Canada [Member] | Revolving Credit Facility A [Member]
Line of Credit Facility, Maximum Borrowing Capacity	5,000,000
Bank of Montreal and Royal Bank of Canada [Member] | Revolving Reducing Term Facility B [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 15,000,000
Bank of Montreal and Royal Bank of Canada [Member] | Credit Facility B and C [Member] | Draws for Share Repurchases [Member]
Debt Instrument, Term	4 years
Bank of Montreal and Royal Bank of Canada [Member] | Credit Facility B and C [Member] | Draws for Acquisitions [Member]
Debt Instrument, Term	5 years
Bank of Montreal and Royal Bank of Canada [Member] | Credit Facility B and C [Member] | Draws for FFTH Capital Expenditures [Member]
Debt Instrument, Term	7 years
Bank of Montreal and Royal Bank of Canada [Member] | Credit Card Facilities [Member]
Line of Credit Facility, Maximum Borrowing Capacity										$ 5,000,000
Bank of Nova [member] | Corporate Credit Card Program [Member]
Line of Credit Facility, Maximum Borrowing Capacity				$ 1,000,000					CAD 0.5

X

- Definition

Represents the line of credit facility covenant period.

+ References

No definition available.

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- Definition

Amount of increase in 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

No definition available.

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- Definition

The amount that the loan facility may not exceed a specified funded share repurchases.

+ References

No definition available.

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- Definition

The maximum annual capital expenditures required by the credit facility.

+ References

No definition available.

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- Definition

The ratio for the maximum monetary amount funded share repurchases to 12 months trailing EBITDA.

+ References

No definition available.

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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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The minimum fixed charge coverage ratio.

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- Definition

The percentage amount of excess cash flow that must be used for repayments of the credit facility if certain terms of the line of credit agreement are breached.

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- 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

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- 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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The cash outflow for loan and debt issuance costs.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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