Income Tax - Schedule of Effective Tax Rate (Details) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Income Tax Disclosure [Abstract]
Federal income tax expense (benefit) based on statutory rate, amount	$ (1,598,000)	$ (4,130,000)
State income tax expense (benefit), net of federal taxes, amount		(119,000)
Change in effective state tax rate, amount	340,000
Change in prior year estimate, amount	(971,000)
Impairment of Goodwill, amount		2,072,000
Net operating loss decrease under IRC Section 382		10,579,000
Impact of tax law change and other, amount		2,021,000
Increase (decrease) in valuation allowance, amount	2,664,000	(10,858,000)
Total taxes on income (loss), amount	$ 435,000	$ (435,000)
Federal income tax expense (benefit) based on statutory rate	21.00%	29.70%
State income tax expense (benefit), net of federal taxes	0.00%	0.80%
Change in effective state tax rate	(4.50%)	0.00%
Change in prior year estimate	12.80%	0.00%
Impairment of Goodwill	0.00%	(14.70%)
Net operating loss decrease under IRC Section 382	0.00%	(75.10%)
Impact of tax law change and other	0.00%	(14.50%)
Increase (decrease) in valuation allowance	(35.00%)	76.90%
Total taxes on income (loss)	(5.70%)	3.10%