NOTE 8 - PENSION PLAN BENEFITS (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Pension paid to retired employees	$ 63	$ 63

This element represents the pensions paid to retired employees.

No definition available.

Name:	novb_PensionsPaidToRetiredEmployees
Namespace Prefix:	novb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration