Significant Customers (Details Textual)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues attributable to sales [Line Items]
Total	59.60%	63.90%	50.40%
Telvent [Member]
Revenues attributable to sales [Line Items]
Total	29.70%	15.70%	2.80%
Duke [Member]
Revenues attributable to sales [Line Items]
Total	13.70%	27.20%	6.30%
Eltel [Member]
Revenues attributable to sales [Line Items]
Total	8.10%	11.50%	28.50%
Ebv Avnet [Member]
Revenues attributable to sales [Line Items]
Total	8.10%	9.50%	12.80%