Significant Customers (Details Textual)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues attributable to sales [Line Items]
Total	67.20%	70.10%	65.90%	70.10%
Significant Customers (Textual) [Abstract]
Numbers of customers	6	6	6	6
Telvent [Member]
Revenues attributable to sales [Line Items]
Total	17.90%	26.20%	20.00%	32.20%
Avnet [Member]
Revenues attributable to sales [Line Items]
Total	12.40%	6.50%	12.50%	7.00%
Enel [Member]
Revenues attributable to sales [Line Items]
Total	16.90%	3.80%	12.20%	2.20%
Ubitronix [Member]
Revenues attributable to sales [Line Items]
Total	10.70%	2.40%	11.70%	1.80%
Duke [Member]
Revenues attributable to sales [Line Items]
Total	6.30%	17.50%	7.80%	18.80%
Eltel [Member]
Revenues attributable to sales [Line Items]
Total	3.00%	13.70%	1.70%	8.10%