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Note 10 - Property, Plant and Equipment | 9 Months Ended
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Dec. 31, 2020
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, 2020 and March 31, 2020 are as follows (in thousands):
|  | December 31, 2020 |  |  | March 31, 2020 |
Construction in progress - equipment |  | $ | 111 |  |  | $ | 3,130 |
Land |  |  | 270 |  |  |  | — |
Building |  |  | 1,630 |  |  |  | — |
Equipment and software |  |  | 41,743 |  |  |  | 41,737 |
Furniture and fixtures |  |  | 1,310 |  |  |  | 1,302 |
Leasehold improvements |  |  | 6,306 |  |  |  | 2,477 |
Property, plant and equipment, gross |  |  | 51,370 |  |  |  | 48,646 |
Less accumulated depreciation |  |  | (41,823 | ) |  |  | (40,081 | )
Property, plant and equipment, net |  | $ | 9,547 |  |  | $ | 8,565 |
Depreciation expense was $ 1.2 million and $1.0 million for the three months ended December 31, 2020 and 2019 , respectively. Depreciation expense was $ 2.9 million and $3.1 million for the nine months ended December 31, 2020 and 2019 , respectively. The decrease in construction in progress primarily relates to the completion of capital investments in the Company's HTS equipment and leasehold improvements in the Company's leased facilities in Westminster and Ayer, Massachusetts. The increase in land and building relates to the property added as part of the NEPSI Acquisition.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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