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Significant Accounting Policies - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended
Oct. 31, 2022
Jul. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Oct. 31, 2022
Oct. 31, 2021
Apr. 30, 2022
Accounting Policies [Abstract]              
Cash equivalents $ 0       $ 0   $ 0
Net income (loss) (16,000) $ (319,000) $ 277,000 $ (172,000) (335,000) $ 105,000  
Cash used in operations         3,091,000 1,444,000  
Accumulated deficit (72,317,000)       (72,317,000)   (71,982,000)
Working capital 1,900,000       1,900,000    
Cash and cash equivalents 10,826,000       10,826,000   9,007,000
Unrecognized tax benefits 181,000       181,000   $ 181,000
Income tax penalties and interest expense 0 $ 0 0 $ 0      
Unrecognized tax benefits anticipated during the next 12 months 0       0    
Provision for income taxes $ 14,000   $ 12,000   $ 31,000 $ 26,000