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Significant Customers	12 Months Ended
Significant Customers	Apr. 30, 2019
Risks and Uncertainties [Abstract]
Significant Customers	Significant Customers For the year ended April 30, 2019, one of our customers accounted for more than 10.0% of our total revenue in the amount of $2.9 million or 10.7%. The revenue from this customer is part of the TOS business and captured in the consolidated oncology services revenue line item within the income statement. For the year ended April 30, 2018, two of our customers accounted for more than 10.0% of our total revenue in the amount of $4.2 million and $2.6 million, or 20.6% and 12.8%. The revenue from this customer is part of the TOS business and was captured in the consolidated oncology services revenue line item within the income statement. As of April 30, 2019, none of our customers accounted for more than 10.0% of our total accounts receivable balance. As of April 30, 2018, two of our customers accounted for more than 10.0% of our total accounts receivable balance in the amount of $878,530 and $736,071, or 22.6% and 19.0%, respectively.