Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Apr. 30, 2015	Apr. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 1,156,298	$ 146,429	$ 1,815,104	$ 163,239	$ 1,815,104	$ 163,239
Weighted-average shares, Basic	4,166,758	4,044,240	4,157,516	4,036,387
Weighted-average shares, Effect of dilutive stock options	47,559	75,938	83,484	82,324
Weighted-average shares, Diluted	4,214,317	4,120,178	4,241,000	4,118,711
Basic earnings per share	$ 0.28	$ 0.04	$ 0.44	$ 0.04
Diluted earnings per share	$ 0.27	$ 0.04	$ 0.43	$ 0.04