Summary of Significant Accounting Policies - Stock Option Expense (Details Narrative) (USD $)	3 Months Ended		9 Months Ended			3 Months Ended			3 Months Ended		1 Months Ended				3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013 Stock Options Two Thousand One Incentive and Non-statutory Stock Option Plan [Member]	Jan. 31, 2013 Stock Options Two Thousand One Incentive and Non-statutory Stock Option Plan [Member] Minimum	Jan. 31, 2013 Stock Options Two Thousand One Incentive and Non-statutory Stock Option Plan [Member] Maximum	Jan. 31, 2013 Stock Options Two Thousand Eleven Incentive and Non-statutory Stock Option Plan [Member]	Jan. 31, 2013 Stock Options Two Thousand Eleven Incentive and Non-statutory Stock Option Plan [Member] Minimum	Jan. 31, 2013 Stock Options Two Thousand Eleven Incentive and Non-statutory Stock Option Plan [Member] Maximum	Sep. 23, 2010 Nonqualified Stock Options 2010-09-23 Mr. Sheerr	Sep. 22, 2011 Nonqualified Stock Options 2011-09-22 Mr. Sheerr	Jul. 19, 2012 Nonqualified Stock Options 2012-07-19 Mr. Sheerr	Jun. 30, 2008 Stock Options One	Jan. 31, 2013 Nonqualified Stock Options Director	Jan. 31, 2013 Nonqualified Stock Options Minimum Director	Jan. 31, 2013 Nonqualified Stock Options Maximum Director
Summary of Significant Accounting Policies (Textual) [Abstract]
Number of shares allowed for granting under the plan					300,000			33,333
Vesting periods for options						1 year	5 years		1 year	5 years	1 year	1 year	1 year			1 year	2 years
Number of shares granted			16,667								16,667	16,667	16,667	8,333
Options expiration period											EXPIRE FIVE YEARS AFTER DATE OF GRANT.	EXPIRE FIVE YEARS AFTER DATE OF GRANT.	EXPIRE FIVE YEARS AFTER DATE OF GRANT.	EXPIRE TEN YEARS AFTER THE DATE OF GRANT.	EXPIRE EITHER FIVE OR TEN YEARS AFTER DATE OF GRANT.
Stock-based compensation expense	$ 26,000	$ 95,000	$ 205,033	$ 378,523
Total unrecognized compensation costs related to stock options	$ 51,000		$ 51,000
Total unrecognized compensation costs related to stock options, Weighted average period for recognition	6 months
Exercise price of options granted														$ 15.60
Percentage of options exercisable on date of grant														100.00%