Revenue by Geographic Location (Details) - USD ($)		12 Months Ended
		Apr. 30, 2016	Apr. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		$ 25,182,000	$ 28,258,000
Total assets		5,751,000	6,275,000
Long lived assets			1,498,000
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		19,713,000	23,285,000
Total assets		5,743,000	6,269,000
Long lived assets		1,490,000	1,498,000
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues		4,405,000	3,785,000
Total assets		8,000	6,000
Long lived assets		0	0
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	[1]	1,064,000	1,188,000
Total assets	[1]	0	0
Long lived assets	[1]	$ 0	$ 0

[1] Principally Asia Pacific Region