Other intangible assets with definite lives (Notes)

9 Months Ended

Oct. 31, 2015

Other intangible assets with definite lives [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 $2.73 million and $2.68 million as of October 31, 2015 and January 31, 2015, respectively. Accumulated amortization was approximately $2.32 million and $2.28 million as of October 31, 2015 and January 31, 2015, respectively. Future amortizations over the next five years ending January 31 will be $13,950 in 2016, $51,950 in 2017, $48,900 in 2018, $39,950 in 2019, $36,950 in 2020, and $214,700 thereafter. Patents are included in other assets in the balance sheet.

	Three Months Ended October 31,				Nine Months Ended October 31,
	2015		2014		2015		2014
Patent amortization expense		$14		$13		$40		$38