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Other intangible assets with definite lives (Notes) | 6 Months Ended
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Jul. 31, 2017
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract] |
Schedule of Indefinite-Lived Intangible Assets [Table Text Block] | Other intangible assets with definite lives. The Company owns several patents, including those covering features of its piping and electronic leak detection systems. Patents are capitalized and amortized on a straight-line basis over a period not to exceed the legal lives of the patents. The Company expenses costs incurred to renew or extend the term of intangible assets. Gross patents were $2.63 million as of July 31, 2017 and January 31, 2017. Accumulated amortization was approximately $2.40 million and $2.38 million as of July 31, 2017 and January 31, 2017, respectively. Full year amortizations for the next five years ending January 31 will be $44,700 in 2018, $36,600 in 2019, $33,700 in 2020, $27,100 in 2021, and $17,500 in 2022, with the residual balance of $93,900 to be amortized in future periods thereafter. Patents are included in other assets in the consolidated balance sheets.
| Three Months Ended July 31, | Six Months Ended July 31,
| 2017 |  | 2016 |  | 2017 |  | 2016 |
Patent amortization expense |  | $11 |  |  | $11 |  |  | $22 |  |  | $22 |

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- Definition Disclosure of accounting policy for indefinite-lived intangible assets (that is, those intangible assets not subject to amortization). This accounting policy also may address how the entity assesses whether events and circumstances continue to support an indefinite useful life and how the entity assesses and measures impairment of such assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84158767&loc=d3e18780-107790 + Details
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