NOTE 9 - PENSION PLAN BENEFITS (Detail) (USD $)	3 Months Ended
Jun. 30, 2013	Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]
Pension paid to retired employees	$ 63,000	$ 63,000

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