Concentrations Of Credit Risk And Economic Dependence (Narrative) (Details)	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Net Revenue [Member] \| International Sales [Member]
Concentration Risk [Line Items]
Concentration risk percentage	8.00%	8.00%
Accounts Payable [Member] \| Two Vendors [Member]
Concentration Risk [Line Items]
Concentration risk percentage	78.00%	87.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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