Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended	24 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2015
Life Insurance Policies Transfer [Member]
Other Postretirement Benefits Payable	$ 785,600	$ 1,089,888	$ 1,089,888
Transfer of Ownership of Life Insurance Policy to Retired Officer [Member]
Other Significant Noncash Transaction, Value of Consideration Given	$ 383,000
U.S. Steel Tubular Products, Inc. [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration Risk, Percentage	1.00%	6.00%
Trinity Industries, Inc. [Member] \| Customer Concentration Risk [Member] \| Sales Revenue, Product Line [Member]
Concentration Risk, Percentage	35.00%	21.00%
Customer Concentration Risk [Member] \| Sales Revenue, Net [Member]
Concentration Risk, Percentage			0.00%
Allowance for Doubtful Accounts Receivable	$ 7,276	$ 7,276	$ 7,276
Excess of Replacement or Current Costs over Stated LIFO Value	1,731,000	4,139,000	4,139,000
Income Taxes Paid	381,000	688,000
Dividends Payable, Current	67,994	67,994	$ 67,994
Impairment of Long-Lived Assets Held-for-use	0
Interest Paid, Net	0	$ 0
Unrecognized Tax Benefits	$ 0

For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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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.

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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).

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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 aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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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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The total amount of the entity's obligation as of the balance sheet date under any other retirement plan(s), such as one or more defined contribution plans.

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No definition available.

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The value of the noncash (or part noncash) consideration given (for example, liability, equity) in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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Amount of unrecognized tax benefits.

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