Note 9 - Property, Plant and Equipment

12 Months Ended

Mar. 31, 2019

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

9.

 Property, Plant and Equipment

The cost and accumulated depreciation of property and equipment at

March 

31,

2019

and

2018

are as follows (in thousands):

	March 31, 2019			March 31, 2018
Construction in progress - equipment	$	603		$	654
Equipment and software		45,705			72,760
Furniture and fixtures		1,269			1,878
Leasehold improvements		1,955			1,426
Property, plant and equipment, gross		49,532			76,718
Less accumulated depreciation		(40,560	)		(64,205	)
Property, plant and equipment, net	$	8,972		$	12,513

Depreciation expense was

$4.3

million and

$11.0

million, for the fiscal years ended

March 

31,

2019

and

2018,

respectively. Included in depreciation expense for the year ended

March 

31,

2018

is

$4.9

million of accelerated depreciation recorded to cost of revenues related to revised estimates of the remaining useful lives of certain pieces of manufacturing equipment. Construction in progress - equipment primarily includes capital investments in the Company's leased facility in Ayer, Massachusetts.