Significant Customers (Details Textual)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues attributable to sales [Line Items]
Total	53.70%	67.10%	62.90%	65.80%
Telvent [Member]
Revenues attributable to sales [Line Items]
Total	22.00%	15.30%	29.50%	14.40%
Duke [Member]
Revenues attributable to sales [Line Items]
Total	9.60%	32.70%	16.40%	28.50%
Eltel [Member]
Revenues attributable to sales [Line Items]
Total	13.70%	10.30%	9.60%	12.60%
Ebv Avnet [Member]
Revenues attributable to sales [Line Items]
Total	8.40%	8.80%	7.40%	10.30%