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Concentrations and Credit Risk (Narrative) (Details)
 6 Months Ended
Jun. 30, 2018
Concentrations And Credit Risk 1 10.00%
Concentrations And Credit Risk 2 10.00%
Concentrations And Credit Risk 3 10.00%
Concentrations And Credit Risk 4 10.00%
Concentrations And Credit Risk 5 10.00%
Concentrations And Credit Risk 6 10.00%