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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Significant Accounting Policies [Line Items]
Excess of replacement cost over LIFO cost	$ 6,504,000	$ 8,880,000
Income taxes paid	3,666,000	4,329,000
Interest paid	0	0
Accrued dividends	$ 543,956	$ 883,928
U.S. Steel Tubular Products, Inc
Significant Accounting Policies [Line Items]
Percentage of total sales	14.00%	24.00%
Trinity Industries, Inc.
Significant Accounting Policies [Line Items]
Percentage of total sales	11.00%

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.