Employee Stock Compensation (Details Textual) (USD $)	6 Months Ended									6 Months Ended				6 Months Ended			12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2012 Equity Incentive 2009 Plan [Member]	Jul. 31, 2011 Equity Incentive 2009 Plan [Member]	Jul. 31, 2012 Equity Incentive 2006 Plan [Member]	Jul. 31, 2011 Equity Incentive 2006 Plan [Member]	Jul. 31, 2012 Equity Incentive 2012 Plan [Member]	Jul. 31, 2011 Equity Incentive 2012 Plan [Member]	Jun. 20, 2012 Equity Incentive 2012 Plan [Member]	Jul. 31, 2012 Selling, General and Administrative Expenses [Member]	Jul. 31, 2011 Selling, General and Administrative Expenses [Member]	Jul. 31, 2012 Restricted Stock [Member] Equity Incentive 2009 Plan [Member]	Jun. 17, 2009 Restricted Stock [Member] Equity Incentive 2009 Plan [Member]	Jul. 31, 2012 Restricted Stock [Member] Equity Incentive 2012 Plan [Member]	Jul. 31, 2012 Director Option Plan [Member]	Jul. 31, 2011 Director Option Plan [Member]	Jan. 31, 2010 Non Employee Director [Member]
Share-Based Compensation Arrangement By Share-Based Payment Award, Purchase Price Of Common Stock, Percent	133.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																	5,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant																	1,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized									310,000				253,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period												104,989
Granted during FY13 through July 31, 2012, Total restricted stock plan												35,989		216,172
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number														154,672
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value												$ 8.36		$ 6.44
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Stock Options												$ 72,708		$ 1,337,239
Employee Service Share-Based Compensation, Nonvested Awards, Total Compensation Cost Not Yet Recognized, Stock Options At Base Line Performance												72,708		941,179
Share-based Compensation	176,878	367,882	100,129	330,397	0	4,029	52,119	0							24,630	33,456
Allocated Share-based Compensation Expense										$ 64,560	$ 134,277