Treasury Stock and Repurchase Program (Detail Textuals) (USD $)	3 Months Ended		1 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Sep. 19, 2012 September 2012 Share Repurchase Program	Jan. 31, 2011 January 2011 Share Repurchase Program	Jan. 31, 2011 Former Repurchase Program
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount of common stock			$ 3,000,000
Number of treasury shares	3,053		19,953	18,400	85,219
Total average cost	$ 42,000	$ 226,000	$ 182,000	$ 354,000	$ 1,036,000