Note 5 - Stockholders' Equity (Details) - Equity award activity, Stock options (USD $)	3 Months Ended	12 Months Ended
	Jul. 31, 2013	Apr. 30, 2013
Equity award activity, Stock options [Abstract]
Number of Shares	262,167	205,500
Weighted-Average Exercise Price (in Dollars per share)	$ 4.64	$ 4.28
Weighted-Average Remaining Contract Life	7 years 36 days	6 years 197 days
Granted	60,000
Granted (in Dollars per share)	$ 5.86
Granted	9 years 302 days
Exercised	3,333
Exercised (in Dollars per share)	$ 4.00
Outstanding exercisable at July 31, 2013	136,917
Outstanding exercisable at July 31, 2013 (in Dollars per share)	$ 4.42
Outstanding exercisable at July 31, 2013	5 years 73 days