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Manufacturing Segment Data (Details) (USD $)	3 Months Ended		9 Months Ended
	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2012	Oct. 31, 2011
Domestic Sales, Value	$ 9,800,000	$ 12,700,000	$ 28,700,000	$ 41,000,000
International Sales, Value	14,400,000	12,000,000	43,000,000	35,200,000
Total Sales, Value	$ 24,238,573	$ 24,744,033	$ 71,718,608	$ 76,162,356
Domestic Sales, Percentage	41.00%	51.00%	40.00%	53.00%
International Sales, Percentage	59.00%	49.00%	60.00%	47.00%
Total Sales, Percentage	100.00%	100.00%	100.00%	100.00%

X

- Definition

Percentage of revenues from external customers attributed to the entity's country of domicile.

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- Definition

Percentage of revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

+ References

No definition available.

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- Definition

Revenues from external customers attributed to the entity's country of domicile.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Revenues from external customers attributed to all foreign countries in total from which the entity derives revenues.

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

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- Definition

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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

-Publisher FASB

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- Definition

The percentage of net product revenue to total net revenue from the sale of goods as of year end.

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