Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Significant Accounting Policies [Line Items]
Excess of replacement cost over LIFO cost	$ 4,139,000	$ 9,024,000
Income taxes paid	688,000us-gaap_IncomeTaxesPaid	748,000us-gaap_IncomeTaxesPaid
Interest paid	0us-gaap_InterestPaidNet	0us-gaap_InterestPaidNet
Accrued dividends	$ 67,994us-gaap_DividendsPayableCurrent	$ 135,989us-gaap_DividendsPayableCurrent
U.S. Steel Tubular Products, Inc \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Significant Accounting Policies [Line Items]
Percentage of total sales	6.00%	15.00%
Trinity Industries, Inc. \| Customer Concentration Risk [Member] \| Coil \| Sales Revenue, Product Line [Member]
Significant Accounting Policies [Line Items]
Percentage of total sales	21.00%	14.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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- Definition

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Current Liabilities

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The excess of replacement or current cost over the stated LIFO (last in first out) inventory value when the LIFO inventory method is utilized.

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

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

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