Significant Customers (Details Textual)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Revenues attributable to sales [Line Items]
Total	39.60%	35.20%
Significant Customers (Textual) [Abstract]
Numbers of customers	2
Avnet [Member]
Revenues attributable to sales [Line Items]
Total	24.40%	27.20%
Enel [Member]
Revenues attributable to sales [Line Items]
Total	15.20%	8.00%