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Note 10 - Accounting for the Costs of Computer Software Developed for Internal Use (Details Textual) - USD ($)
6 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Capitalized Computer Software, Additions $ 52,000 $ 0
Capitalized Computer Software, Amortization $ 79,000 $ 325,000
Minimum [Member]    
Finite-Lived Intangible Asset, Useful Life 3 years  
Maximum [Member]    
Finite-Lived Intangible Asset, Useful Life 5 years