Goodwill And Other Intangible Assets (Narrative) (Details)	3 Months Ended			6 Months Ended		12 Months Ended
	Oct. 31, 2015 USD ($) item	Jul. 31, 2015 USD ($) item	Oct. 31, 2014 USD ($)	Oct. 31, 2015 USD ($)	Oct. 31, 2014 USD ($)	Apr. 30, 2015 USD ($) item	Apr. 30, 2014 USD ($) item	Apr. 30, 2013 USD ($) item	May. 31, 2012 USD ($)
Goodwill And Other Intangible Assets [Abstract]
Changes in goodwill carrying amount	$ 0		$ 0	$ 0	$ 0
Goodwill	3,222,899		3,222,899	3,222,899	3,222,899	$ 3,222,899
Amortization expense	$ 118,515		$ 109,032	233,869	$ 210,546
Estimated fair value of contingent consideration									$ 2,320,000
Number of quarterly payments for consideration with the Spitfire aquisition | item	1	1				4	4	3
Quarterly payment for business acquisition	$ 102,662	$ 38,914		102,662		$ 65,000	$ 65,000	$ 65,000
Contingent consideration liability	$ 1,357,408			$ 1,357,408