Organization, Use of Estimates and Basis of Presentation (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2016	Jan. 31, 2015	Apr. 30, 2015
Working Capital Deficit	$ 1,100,000		$ 1,100,000
Cash Equivalents, at Carrying Value	3,300,000		3,300,000
Unrecognized Tax Benefits	165,000		165,000		$ 100,000
Income Tax Expense (Benefit)	$ 31,000	$ 12,000	$ 76,000	$ 27,000