Other intangible assets with definite lives (Notes)

3 Months Ended

Apr. 30, 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 April 30, 2017 and January 31, 2017. Accumulated amortization was approximately $2.39 million and $2.38 million as of April 30, 2017 and January 31, 2017, respectively. Full year amortizations for the next five years ending January 31 will be $45,100 in 2018, $36,600 in 2019, $33,700 in 2020, $27,100 in 2021, $17,500 in 2022, with the residual balance of $92,660 to be amortized in future periods thereafter. Patents are included in other assets in the consolidated balance sheets.

Three Months Ended April 30,

Patent amortization expense