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Discontinued Operations (Details)
 12 Months Ended
Feb. 22, 2019
USD ($)
Jun. 29, 2018
USD ($)
Apr. 30, 2021
USD ($)
contract
Apr. 30, 2020
USD ($)
Apr. 30, 2019
USD ($)
Discontinued operations          
Amount of alleged damages $ 6,500,000        
Statement of operations          
Loss from discontinued operations, net of tax         $ (2,964,000)
(Loss) gain on sale of business, net of tax (benefit) expense of $(76) and $2,444 for the year ended April 30, 2020 and April 30, 2019, respectively       $ (265,000) 8,490,000
Tax expense       (76,000) 2,444,000
Net (loss) income from discontinued operations       (265,000) 5,526,000
Other expense          
Discontinued operations          
Litigation reserve expense     $ 9,300,000    
EES Business | Disposed of by sale          
Discontinued operations          
Cash consideration received   $ 31,994,000      
Gain on sale of business   $ 11,420,000     (486,000)
Working capital dispute       922,000  
Amounts recorded in the consolidated financial statements       341,000  
Statement of operations          
Tax expense       (76,000) 2,444,000
EES Business | Disposed of by sale | Other income, net          
Statement of operations          
Net Sales     38,000 551,000 2,758,000
EES Business | Discontinued Operations          
Statement of operations          
Net Sales         4,256,000
Cost of sales         5,097,000
Gross margin         (841,000)
Selling, general and administrative         1,515,000
Research and development         1,072,000
Other income, net         1,000
Loss from discontinued operations before income taxes         (3,427,000)
Benefit for income taxes         (463,000)
Loss from discontinued operations, net of tax         (2,964,000)
(Loss) gain on sale of business, net of tax (benefit) expense of $(76) and $2,444 for the year ended April 30, 2020 and April 30, 2019, respectively       (265,000) 8,490,000
Net (loss) income from discontinued operations       $ (265,000) $ 5,526,000
Holdback | Disposed of by sale          
Discontinued operations          
Cash consideration received     $ 6,500,000    
Number of remaining contracts | contract     2