Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Change in carrying value of goodwill

The change in the carrying value of goodwill during fiscal 2016 was as follows (dollars in thousands):

Balance at March 31, 2015	$	4,409
Impairments	(4,409		)
Balance at March 31, 2016	$	—

Schedule of intangible assets and goodwill

Amortizable intangible assets are amortized over their estimated economic useful life to reflect the pattern of economic benefits consumed based upon the following lives and methods:

Patents	10-17 years	Straight-line
Licenses	7-13 years	Straight-line
Customer relationships	5-8 years	Accelerated based upon the pattern of economic benefits consumed
Developed technology	8 years	Accelerated based upon the pattern of economic benefits consumed
Non-competition agreements	5 years	Straight-line

The components of, and changes in, the carrying amount of other intangible assets were as follows (dollars in thousands):

	March 31, 2017							March 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Patents	$	2,658	$	(1,211	)	$	1,447	$	2,377	$	(1,053	)	$	1,324
Licenses	58		(58		)	—		58		(58		)	—
Trade name and trademarks	1,715		—			1,715		1,956		—			1,956
Customer relationships	3,600		(3,054		)	546		3,600		(2,512		)	1,088
Developed technology	900		(426		)	474		900		(265		)	635
Non-competition agreements	100		(75		)	25		100		(55		)	45
Total	$	9,031	$	(4,824	)	$	4,207	$	8,991	$	(3,943	)	$	5,048

As of March 31, 2017, the weighted average useful life of intangible assets was 6.0 years. The estimated amortization expense for each of the next five years is shown below (dollars in thousands): 

Fiscal 2018	$	621
Fiscal 2019	445
Fiscal 2020	359
Fiscal 2021	285
Fiscal 2022	167
Thereafter	615
	$	2,492

Amortization expense is set forth in the following table (dollars in thousands):

	Fiscal Year Ended March 31,
	2017		2016		2015
Amortization included in cost of sales:
Patents	$	158	$	139	$	132
Total	$	158	$	139	$	132
Amortization included in operating expenses:
Customer relationships	$	542	$	891	$	1,085
Developed technology	161		156		90
Non-competition agreements	20		20		20
Patents	—		9		—
Total	723		1,076		1,195
Total amortization	$	881	$	1,215	$	1,327