Schedule of Interest Rate Derivatives (Details) (USD $)	12 Months Ended
Dec. 31, 2012
Interest Rate Swap Contract Schedule Of Interest Rate Derivatives 1	$ 54,896

Interest Rate Swap Contract Schedule Of Interest Rate Derivatives 1

No definition available.

Name:	nrds_ScheduleOfInterestRateDerivativesZeroOneThreeOneNineOneSevenFiveTwoNineVNinerPGSFourFMBN
Namespace Prefix:	nrds_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration