Goodwill and Other Intangible Assets (Details) (USD $)	3 Months Ended
	Apr. 30, 2013	Jan. 31, 2013
Goodwill and Other Intangible Assets
Goodwill	$ 4,320,000	$ 4,320,000
Gross Carrying Amount	6,778,000	6,826,000
Accumulated Amortization	(2,963,000)	(2,837,000)
Net Carrying Amount	3,815,000	3,989,000
Proprietary rights [Member]
Goodwill and Other Intangible Assets
Weighted Average Remaining Life	7 years 2 months 12 days
Gross Carrying Amount	3,481,000	3,503,000
Accumulated Amortization	(1,657,000)	(1,625,000)
Net Carrying Amount	1,824,000	1,878,000
Customer relationships [Member]
Goodwill and Other Intangible Assets
Weighted Average Remaining Life	4 years 9 months 18 days
Gross Carrying Amount	2,383,000	2,402,000
Accumulated Amortization	(943,000)	(876,000)
Net Carrying Amount	1,440,000	1,526,000
Patents [Member]
Goodwill and Other Intangible Assets
Weighted Average Remaining Life	4 years 9 months 18 days
Gross Carrying Amount	718,000	724,000
Accumulated Amortization	(284,000)	(264,000)
Net Carrying Amount	434,000	460,000
Trade name [Member]
Goodwill and Other Intangible Assets
Weighted Average Remaining Life	4 years 9 months 18 days
Gross Carrying Amount	196,000	197,000
Accumulated Amortization	(79,000)	(72,000)
Net Carrying Amount	$ 117,000	$ 125,000