Significant Customers (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues attributable to sales [Line Items]
Total	57.90%	62.90%	63.70%	68.20%
Significant Customers (Textual) [Abstract]
Numbers of customers	7	7	7	7
Telvent [Member]
Revenues attributable to sales [Line Items]
Total	8.00%	22.00%	16.80%	29.50%
Avnet [Member]
Revenues attributable to sales [Line Items]
Total	17.10%	8.40%	13.80%	7.40%
Enel [Member]
Revenues attributable to sales [Line Items]
Total	14.00%	6.10%	12.60%	3.20%
Ubitronix [Member]
Revenues attributable to sales [Line Items]
Total	4.70%	3.10%	9.80%	2.10%
Duke [Member]
Revenues attributable to sales [Line Items]
Total	1.10%	9.60%	6.00%	16.40%
Ericsson [Member]
Revenues attributable to sales [Line Items]
Total	12.80%	0.00%	3.40%	0.00%
Eltel [Member]
Revenues attributable to sales [Line Items]
Total	0.20%	13.70%	1.30%	9.60%