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Note 6 - Loan Payable (Details Textual)		3 Months Ended
	Jan. 20, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Oct. 01, 2018	Oct. 01, 2017	Jan. 19, 2017 USD ($)
Payments of Financing Costs	$ 591,175	$ 591,175
Line of Credit Facility Covenant Period		1 year 180 days
Foreign Exchange Risk [Member]
Line of Credit Facility, Maximum Borrowing Capacity		$ 3,500,000
Derivative Asset, Fair Value, Gross Asset		$ 20,200,000
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
Repayment Obligation, Percentage of Excess Cash Flow	50.00%
Minimum Fixed Charge Coverage Ratio		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
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
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

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- Definition

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+ References

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- Definition

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

+ References

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- Definition

The maximum annual capital expenditures required by the credit facility.

+ References

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- Definition

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

+ References

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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.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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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.

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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.

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- Definition

The cash outflow for loan and debt issuance costs.

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