Income Taxes - Significant Components of Consolidated Deferred Tax Assets (Liabilities) (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
Deferred tax liabilities:
Depreciation	$ (1,231,047)us-gaap_DeferredTaxLiabilitiesOther	$ (1,555,000)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities	(1,231,047)us-gaap_DeferredTaxLiabilities	(1,555,000)us-gaap_DeferredTaxLiabilities
Deferred tax assets:
Inventory capitalization	201,094	170,000
LIFO Inventory	783,645us-gaap_DeferredTaxAssetsInventory	785,000us-gaap_DeferredTaxAssetsInventory
Postretirement benefits other than pensions	370,562	344,000
Other	63,104us-gaap_DeferredTaxAssetsOther	66,002us-gaap_DeferredTaxAssetsOther
Total deferred tax assets	1,418,405us-gaap_DeferredTaxAssetsNet	1,365,002us-gaap_DeferredTaxAssetsNet
Net deferred tax asset (liability)	$ 187,358us-gaap_DeferredTaxAssetsLiabilitiesNet	$ (189,998)us-gaap_DeferredTaxAssetsLiabilitiesNet

Deferred Tax Assets, Inventory Costs Capitalized

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from inventory.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from postretirement benefits.

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Amount of deferred tax liability attributable to taxable temporary differences not separately disclosed.

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