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Subsequent Event	3 Months Ended
Subsequent Event	Apr. 30, 2016
Subsequent Event [Line Items]
Subsequent Events [Text Block]	Subsequent events. In May, 2016, the Company completed the sale of its former corporate headquarters, land and building, to a third party at a purchase price of $4.4 million. The sale generated approximately $0.4 million in net cash after expenses and mortgage payoffs. In May, 2016, the Company also completed the sale of its Bolingbrook Filtration facility to a third party at a purchase price of $7.1 million. The sale generated approximately $1.9 million in net cash after expenses and mortgage payoffs.