Consolidated Balance Sheets (Parenthetical) (USD $)	Apr. 30, 2015	Jan. 31, 2015
Property, plant and equipment, gross	$ 12,061,000us-gaap_PropertyPlantAndEquipmentGross	$ 10,914,000us-gaap_PropertyPlantAndEquipmentGross
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	500,000us-gaap_PreferredStockSharesAuthorized	500,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding	0us-gaap_PreferredStockSharesOutstanding	0us-gaap_PreferredStockSharesOutstanding
Common stock, par value	$ 0.15	$ 0.15
Common stock, shares authorized	30,000,000us-gaap_CommonStockSharesAuthorized	30,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued	14,672,184us-gaap_CommonStockSharesIssued	14,634,434us-gaap_CommonStockSharesIssued
Common stock, shares outstanding	14,668,951us-gaap_CommonStockSharesOutstanding	14,631,201us-gaap_CommonStockSharesOutstanding
Treasury stock, shares	3,233us-gaap_TreasuryStockShares	3,233us-gaap_TreasuryStockShares
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, gross	$ 3,729,000	$ 2,658,000

Face amount or stated value per share of common stock.

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