Significant Customers (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues attributable to sales [Line Items]
Total	34.30%	35.20%	36.20%	40.70%
Significant Customers (Textual) [Abstract]
Numbers of customers	2	2	2	2
Avnet [Member]
Revenues attributable to sales [Line Items]
Total	26.90%	30.30%	27.40%	28.10%
Enel [Member]
Revenues attributable to sales [Line Items]
Total	7.40%	4.90%	8.80%	12.60%