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Debt (Narrative) (United States Credit Facilities) (Details)			3 Months Ended						12 Months Ended
	Apr. 29, 2016 USD ($)	Dec. 02, 2014 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2015 USD ($)	Jun. 30, 2011 USD ($)
Line of Credit Facility [Line Items]
Credit facilities amount outstanding			$ 14,191,000	$ 9,874,000					$ 9,874,000
United States Credit Facilities B [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity		$ 5,000,000
Percentage of subsidiary shares used to secure borrowings in facility		65.00%
Credit facilities amount outstanding			$ 4,700,000
Debt instrument amortization period		5 years
United States Credit Facilities B [Member] | Bank's Prime Rate [Member]
Line of Credit Facility [Line Items]
Interest rate spread			1.25%
United States Credit Facilities B [Member] | London Interbank Offered Rate Eurodollar Loan [Member]
Line of Credit Facility [Line Items]
Interest rate spread			2.50%
United States Credit Facilities A [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity			$ 10,000,000
Credit facilities amount outstanding			$ 9,400,000
United States Credit Facilities A [Member] | Bank's Prime Rate [Member]
Line of Credit Facility [Line Items]
Interest rate spread			1.00%
United States Credit Facilities A [Member] | London Interbank Offered Rate Eurodollar Loan [Member]
Line of Credit Facility [Line Items]
Interest rate spread			2.25%
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity										$ 15,900,000
Credit facilities amount outstanding			$ 5,800,000
Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Funded debt to EBITDA ratio				2.75	3.65	3.25	3.15	3.15
Minimum fixed charge coverage ratio								1.10	1.25
Amended United States Credit Facilities A [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 14,000,000
Amended United States Credit Facilities A [Member] | Bank's Prime Rate [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Interest rate spread	1.00%
Amended United States Credit Facilities A [Member] | London Interbank Offered Rate Eurodollar Loan [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Interest rate spread	2.25%
Amended United States Credit Facilities B [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facilities amount outstanding	$ 4,718,750
Amended United States Credit Facilities B [Member] | Subsequent Event [Member] | June 30, 2016 to December 31, 2016 [Member]
Line of Credit Facility [Line Items]
Quarterly principal payment	$ 31,250
Quarterly principal payment (percent)	0.625%
United States Revolving Credit Facility MasterCard [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Credit facility, borrowing capacity	$ 100,000
United States Credit Facilities [Member]
Line of Credit Facility [Line Items]
Credit facilities amount outstanding			$ 14,100,000

X

- Definition

Percent of outstanding principal required as a periodic payment applied to principal.

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The ratio of funded debt to EBITDA used in debt covenant.

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Percentage of ownership in subsidiary per agreement as collateral.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Amount of the required periodic payments applied to principal.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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