Schedule II - Valuation and Qualifying Accounts and Reserves (Details) (Total Reserve for Doubtful Accounts and Sales Allowances [Member], USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Total Reserve for Doubtful Accounts and Sales Allowances [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 283,000	$ 320,000	$ 446,000
Additions Charged to Expenses	107,000	81,000	149,000
Deductions from Reserves	(71,000)	(118,000)	(275,000)
Balance at End of Period	$ 319,000	$ 283,000	$ 320,000