Note 10 - Property, Plant and Equipment

6 Months Ended

Sep. 30, 2019

Notes to Financial Statements

Property, Plant and Equipment Disclosure [Text Block]

10.

Property, Plant and Equipment

The cost and accumulated depreciation of property, plant and equipment at

September 30, 2019

and

March 31, 2019

are as follows (in thousands):

	September 30, 2019			March 31, 2019
Construction in progress - equipment	$	2,223		$	603
Equipment and software		45,127			45,705
Furniture and fixtures		1,259			1,269
Leasehold improvements		1,976			1,955
Property, plant and equipment, gross		50,585			49,532
Less accumulated depreciation		(41,975	)		(40,560	)
Property, plant and equipment, net	$	8,610		$	8,972

Depreciation expense was $

1.0

million and

$1.1

million for the

three

months ended

September 30, 2019

and

2018

, respectively. Depreciation expense was $

2.1

million and

$2.1

million for the

six

months ended

September 30, 2019

and

2018

, respectively. Construction in progress - equipment primarily includes capital investments and leasehold improvements in the Company's leased facility in Ayer, Massachusetts.