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Lease information | 12 Months Ended
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Jan. 31, 2012
Lease information [Abstract] |
Leases of Lessee Disclosure [Text Block] | Note 6 - Lease information
Property under capitalized leases | 2011 |  | 2010 |
Machinery and equipment | $1,956 | $512
Furniture and office equipment | — |  | 225 |
Transportation equipment | 63 |  | 48 |
Computer equipment | 208 |  | 154 |
Subtotal | 2,227 |  | 939 |
Less accumulated amortization | 241 |  | 263 |
Total | $1,986 | $676
Fixed assets acquired under capital leases | $917 | $300
Fixed assets acquired in previous years now under capital leases | $845 | $0
Piping systems leases manufacturing and warehouse facilities, land, transportation equipment and office space under non-cancelable operating leases, which expire beginning 2012 through 2034. Filtration products leases approximately 67,000 square feet of production and office space under an operating lease, which began in June 2004 and expires in 2012 and 2013. At January 31, 2012, future minimum annual rental commitments under non-cancelable lease obligations were as follows:
| Operating Leases | Capital Leases
2013 | $2,148 | $518
2014 | 1,765 |  | 465 |
2015 | 1,504 |  | 406 |
2016 | 1,306 |  | 385 |
2017 | 1,242 |  | 359 |
Thereafter | 3,906 |  | — |
Subtotal | 11,871 |  | 2,133 |
Less Amount representing interest | — |  | 302 |
Future minimum lease payments | $11,871 | $1,831
Rental expense for operating leases was $2.5 million and $2.2 million in 2011 and 2010, respectively.

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- Definition The entire disclosure for lessee entity's leasing arrangements including, but not limited to, all of the following: (a.) The basis on which contingent rental payments are determined, (b.) The existence and terms of renewal or purchase options and escalation clauses, (c.) Restrictions imposed by lease agreements, such as those concerning dividends, additional debt, and further leasing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6455398&loc=d3e45280-112737 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6452660&loc=d3e36991-112694 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 13 -Paragraph 16 -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. + Details
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