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Note 12 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($)
12 Months Ended
Apr. 30, 2021
Apr. 30, 2020
Apr. 30, 2019
Capitalized Computer Software, Additions $ 145,000 $ 0 $ 111,000
Internal Costs to Develop Software 0 0 0
Capitalized Computer Software, Amortization $ 70,000 $ 65,000 $ 131,000
Minimum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year) 3 years    
Maximum [Member]      
Finite-Lived Intangible Asset, Useful Life (Year) 5 years