Note 10 - Property, Plant and Equipment

9 Months Ended

Dec. 31, 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

December 31, 2019

and

March 31, 2019

are as follows (in thousands):

	December 31, 2019			March 31, 2019
Construction in progress - equipment	$	2,812		$	603
Equipment and software		45,301			45,705
Furniture and fixtures		1,245			1,269
Leasehold improvements		2,485			1,955
Property, plant and equipment, gross		51,843			49,532
Less accumulated depreciation		(43,003	)		(40,560	)
Property, plant and equipment, net	$	8,840		$	8,972

Depreciation expense was $

1.0

million and

$1.1

million for the

three

months ended

December 31, 2019

and

2018

, respectively. Depreciation expense was $

3.1

million and

$3.2

million for the

nine

months ended

December 31, 2019

and

2018

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