Earnings per Share (Details) (USD $)	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	$ 66,000	$ 30,000	$ 447,000	$ (101,000)
Earnings Per Share, Basic	$ 0.01	$ 0.01	$ 0.08	$ (0.02)
Common Stock [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Attributable to Parent	66,000	30,000	447,000	(101,000)
Undistributed Earnings Allocated to Participating Securities	(3,000)	(1,000)	(20,000)	0
Net Income (Loss) Available to Common Stockholders, Basic	$ 63,000	$ 29,000	$ 427,000	$ (101,000)
Weighted Average Number of Shares Outstanding, Basic	5,265,750	5,034,288	5,265,750	5,189,158
Earnings Per Share, Basic	$ 0.01	$ 0.01	$ 0.08	$ (0.02)