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Note 10 - Property, Plant and Equipment | 9 Months Ended
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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.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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