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Note 6 - Property, Plant and Equipment | 12 Months Ended
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Mar. 31, 2020
Notes to Financial Statements |
Property, Plant and Equipment Disclosure [Text Block] | Note 6 . Property, Plant and Equipment Property, plant and equipment were as follows:
|  | March 31, 2020 |  |  | March 31, 2019 |
Land |  | $ | 889 |  |  | $ | 889 |
Buildings |  |  | 18,880 |  |  |  | 18,648 |
Manufacturing equipment |  |  | 9,851 |  |  |  | 8,732 |
Computer equipment |  |  | 3,601 |  |  |  | 3,698 |
Construction in progress |  |  | 242 |  |  |  | 107 |
Other |  |  | 1,344 |  |  |  | 1,393 |
Gross total |  |  | 34,807 |  |  |  | 33,467 |
Accumulated depreciation |  |  | (12,741 | ) |  |  | (11,242 | )
Property, plant, and equipment, net |  | $ | 22,066 |  |  | $ | 22,225 |
Depreciation expense for the years ended March 31, 2020 , 2019 and 2018 was $2,234, $2,338, and $2,542 respectively.

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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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