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Property, Plant and Equipment and Leases | 12 Months Ended
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Apr. 30, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure [Text Block] | 6. Property, Plant and Equipment, Net Property, plant and equipment, net at April 30, 2020 and 2019, consisted of the following (in thousands):
|  | 2020 |  |  | 2019 |
Buildings and building improvements |  | $ | 2,692 |  |  | $ | 2,692 |
Machinery, equipment and furniture |  |  | 57,916 |  |  |  | 57,157 |
|  |  | 60,608 |  |  |  | 59,849 |
Less, accumulated depreciation and amortization |  |  | (49,341 | ) |  |  | (46,811 | )
|  | $ | 11,267 |  |  | $ | 13,038 |
Depreciation and amortization expense for the years ended April 30, 2020 and 2019 was $3.3 million and $2.8 million, respectively. Maintenance and repairs charged to operations for the years ended April 30, 2020 and 2019 was approximately $706,000 and $309,000, 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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