Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Options, Weighted Average Fair Value [Roll Forward]
Compensation expense related to exit costs	$ 657,000	$ 514,000	$ 719,000	$ 514,000
Future compensation cost expected to be recognized [Abstract]
Fiscal 2015			278,000
Fiscal 2016			472,000
Fiscal 2017			313,000
Fiscal 2018			212,000
Fiscal 2019			40,000
Weighted average fair value of options granted and the assumptions used [Abstract]
Term of U.S. Treasury yield curve used to estimate average risk-free interest rate			10 years
Additional information about options outstanding [Abstract]
Fair value of in-the-money stock options outstanding	1,500,000	698,000	1,500,000	698,000
Additional information about exercisable options [Abstract]
Fair value of in-the-money exercisable stock options	545,000	384,000	545,000	384,000
Stock Options [Member]
Options, Shares [Roll Forward]
Options outstanding, beginning of period (in shares)			815,162
Granted (in shares)	40,000		340,000
Forfeited (in shares)			0
Exercised (in shares)			(22,500)
Options outstanding, end of period (in shares)	1,132,662		1,132,662
Options exercisable, end of period (in shares)	667,351		667,351
Options, Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)			$ 4.25
Granted (in dollars per share)			$ 3.43
Forfeited (in dollars per share)			$ 0
Exercised (in dollars per share)			$ 1.27
Options outstanding, end of period (in dollars per share)	$ 4.06		$ 4.06
Options exercisable, end of period (in dollars per share)	$ 4.21		$ 4.21
Options, Weighted Average Fair Value [Roll Forward]
Options outstanding, beginning of period (in dollars per share)			$ 3.27
Granted (in dollars per share)			$ 2.51
Forfeited (in dollars per share)			$ 0
Exercised (in dollars per share)			$ 1.02
Options outstanding, end of period (in dollars per share)	$ 3.09		$ 3.09
Options exercisable, end of period (in dollars per share)	$ 3.25		$ 3.25
Compensation expense related to current year	40,000	42,000	79,000	84,000
Annual sales threshold amount for vesting of stock options			100,000,000
Weighted average fair value of options granted and the assumptions used [Abstract]
Expected average life (in years)	10 years
Expected volatility (in hundredths)	65.70%
Expected dividend yield (in hundredths)	0.00%
Stock Options [Member] | Minimum [Member]
Weighted average fair value of options granted and the assumptions used [Abstract]
Expected average risk-free interest rate (in hundredths)	2.10%
Stock Options [Member] | Maximum [Member]
Weighted average fair value of options granted and the assumptions used [Abstract]
Expected average risk-free interest rate (in hundredths)	2.19%
Stock Options [Member] | Officers [Member]
Options, Shares [Roll Forward]
Granted (in shares)	300,000
Options, Weighted Average Fair Value [Roll Forward]
Compensation expense related to current year	24,000
Compensation expense for stock options related to previous year	66,000	166,000	132,000	232,000
Compensation expense related to exit costs		101,000		101,000
Restricted Stock [Member]
Options, Weighted Average Fair Value [Roll Forward]
Annual sales threshold amount for vesting of stock options			100,000,000
Additional information about exercisable options [Abstract]
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted	656,000		656,000
Weighted average period for recognition of unrecognized compensation cost			3 years 9 months 18 days
Restricted Stock Grants, Number of Shares [Roll Forward]
Restricted stock awards, beginning of period (in shares)			275,547
Granted (in shares)			207,000
Forfeited (in shares)			(2,834)
Vested (in shares)			(154,003)
Relinquished for taxes (in shares)			(27,014)
Restricted stock awards, end of period (in shares)	298,696		298,696
Weighted Average Grant Date Fair Value [Roll Forward]
Restricted stock awards, beginning of period (in dollars per share)			$ 3.42
Granted (in dollars per share)			$ 3.43
Forfeited (in dollars per share)			$ 4.74
Vested (in dollars per share)			$ 2.52
Relinquished for taxes (in dollars per share)			$ 2.52
Restricted stock awards, end of period (in dollars per share)	$ 3.96		$ 3.96
Restricted Stock [Member] | Officers [Member]
Options, Shares [Roll Forward]
Granted (in shares)	200,000
2001 Stock Plan [Member] | Restricted Stock [Member]
Additional information about exercisable options [Abstract]
Unrecognized compensation cost related to non-vested share-based compensation arrangements granted	$ 467,000		$ 467,000
Weighted average period for recognition of unrecognized compensation cost			4 years
2001 Stock Plan [Member] | Restricted Stock [Member] | Minimum [Member]
Options, Weighted Average Fair Value [Roll Forward]
Vesting period			3 years
2001 Stock Plan [Member] | Restricted Stock [Member] | Maximum [Member]
Options, Weighted Average Fair Value [Roll Forward]
Vesting period			4 years
2005 Non-Employee Directors' Plan [Member] | Stock Options [Member] | Directors [Member]
Options, Weighted Average Fair Value [Roll Forward]
Options issued (in shares)	10,000