Valuation and Qualifying Accounts (Detail) (Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account), USD $)	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Allowance for doubtful accounts receivable and cash discounts (deducted from related asset account)
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 37,276		$ 37,276
Additions, Charged to Costs and Expenses			27,120
Additions, Charged to Other Accounts- Describe	736,502	[1]	823,771	[1]
Deductions- Describe	736,502	[2]	850,891	[2]
Balance at End of Period	$ 37,276		$ 37,276

[1] Cash discounts allowed on sales and charged against revenue.

[2] Accounts receivable written off and cash discounts allowed on sales.