Note 6 - Net Income Per Share (Detail) - Basic and diluted income per share (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Apr. 30, 2012
Net income (in Dollars)	$ 716	$ 262	$ 968	$ 754	$ 1,219
Weighted average common shares Outstanding – basic	3,914	3,789	3,895	3,789
Effect of dilutive options outstanding	11	117	9	130
Weighted average common shares outstanding – diluted	3,925	3,906	3,904	3,919