Significant Components of Consolidated Deferred Tax Assets (Liabilities) (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Deferred tax liabilities:
Depreciation	$ (1,700,000)	$ (1,756,129)
Total deferred tax liabilities	(1,700,000)	(1,756,129)
Deferred tax assets:
Inventory capitalization	170,000	173,990
LIFO Inventory	785,000	788,145
Postretirement benefits other than pensions	316,000	290,271
Other	66,721	57,724
Total deferred tax assets	1,337,721	1,310,130
Net deferred tax liability	$ (362,279)	$ (445,999)