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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS | 12 Months Ended
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Apr. 30, 2020
SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS |
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | SUPPLEMENTARY DATA ​ SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Additions | ​ | ​ | ​ | ​ | ​ | ​ |
​ |  | Balance at |  | Charged to |  | Charged to |  | ​ | ​ |  | Balance at |
​ | ​ | Beginning | ​ | Costs and | ​ | Other | ​ | ​ | ​ | ​ | End of |
Description | ​ | of Period | ​ | Expenses | ​ | Accounts | ​ | Deductions | ​ | Period |
​ | ​ | (In thousands) |
Allowance for doubtful accounts for the year ended April 30: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2018 | ​ | $ | 104 | ​ | $ | 976 | ​ | $ | — | ​ | $ | — | ​ | $ | 1,080 | ​
2019 | ​ | $ | 1,080 | ​ | $ | 198 | ​ | $ | — | ​ | $ | (237) | ​ | $ | 1,041 | ​
2020 | ​ | $ | 1,041 | ​ | $ | 219 | ​ | $ | — | ​ | $ | (70) | ​ | $ | 1,190 | ​
Warranty reserve for the year ended April 30: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2018 | ​ | $ | 1,947 | ​ | $ | 1,884 | ​ | $ | — | ​ | $ | (1,741) | ​ | $ | 2,090 | ​
2019 | ​ | $ | 2,090 | ​ | $ | 702 | ​ | $ | — | ​ | $ | (1,088) | ​ | $ | 1,704 | ​
2020 | ​ | $ | 1,704 | ​ | $ | 2,069 | ​ | $ | — | ​ | $ | (1,758) | ​ | $ | 2,015 | ​
Reserve for inventory excess and obsolescence for the year ended April 30: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2018 | ​ | $ | 2,756 | ​ | $ | 2,758 | ​ | $ | — | ​ | $ | (1,561) | ​ | $ | 3,953 | ​
2019 | ​ | $ | 3,953 | ​ | $ | 5,054 | ​ | $ | — | ​ | $ | (1,183) | ​ | $ | 7,824 | ​
2020 | ​ | $ | 7,824 | ​ | $ | 5,377 | ​ | $ | — | ​ | $ | (2,969) | ​ | $ | 10,232 | ​
Reserve for self-insured medical claims for the year ended April 30: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
2018 | ​ | $ | 1,133 | ​ | $ | 9,100 | ​ | $ | — | ​ | $ | (9,230) | ​ | $ | 1,003 | ​
2019 | ​ | $ | 1,003 | ​ | $ | 10,808 | ​ | $ | — | ​ | $ | (10,867) | ​ | $ | 944 | ​
2020 | ​ | $ | 944 | ​ | $ | 13,031 | ​ | $ | — | ​ | $ | (13,222) | ​ | $ | 753 | ​
​

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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