Stock-Based Compensation Plans (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended			6 Months Ended						6 Months Ended												6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012	Jul. 31, 2012	Jan. 31, 2013 2000 Stock Option Plan [Member]	Oct. 31, 2012 2000 Stock Option Plan [Member]	Jul. 31, 2012 2000 Stock Option Plan [Member]	Jan. 31, 2012 2000 Stock Option Plan [Member]	Oct. 31, 2011 2000 Stock Option Plan [Member]	Jul. 31, 2011 2000 Stock Option Plan [Member]	Jan. 31, 2013 2000 Stock Option Plan [Member] Maximum [Member]	Jan. 31, 2013 2000 Stock Option Plan [Member] Minimum [Member]	Jan. 31, 2013 2010 Stock Option Plan [Member]	Oct. 31, 2012 2010 Stock Option Plan [Member]	Jul. 31, 2012 2010 Stock Option Plan [Member]	Jan. 31, 2012 2010 Stock Option Plan [Member]	Oct. 31, 2011 2010 Stock Option Plan [Member]	Jul. 31, 2011 2010 Stock Option Plan [Member]	Jan. 31, 2013 2010 Stock Option Plan [Member] Maximum [Member]	Jan. 31, 2012 2010 Stock Option Plan [Member] Maximum [Member]	Jan. 31, 2013 2010 Stock Option Plan [Member] Minimum [Member]	Jan. 31, 2012 2010 Stock Option Plan [Member] Minimum [Member]	Jan. 31, 2013 Executive Officer [Member] Restricted stock under the 2010 Plan [Member]	Jul. 31, 2015 Scenario, Forecast [Member]	Jul. 31, 2014 Scenario, Forecast [Member]	Jul. 31, 2013 Scenario, Forecast [Member]	Jan. 31, 2013 Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 48,000	$ 27,000	$ 85,000	$ 43,000
Unrecognized compensation costs	232,000		232,000		164,000
Number of outstanding options expired						997,961	1,002,461	1,099,769	1,157,269	1,173,594	1,236,333			449,335	324,167	310,667	259,917	117,875	54,250
Weighted average exercise price, outstsanding, options expired						$ 1.41	$ 1.40	$ 1.41	$ 1.38	$ 1.37	$ 1.36	$ 2.74	$ 0.15	$ 1.17	$ 1.10	$ 1.10	$ 0.94	$ 0.75	$ 0.67	$ 1.70	$ 0.922	$ 0.575	$ 0.575
Common stock authorized for issuance						1,950,000								650,000
Stock option grants exercisable period												10 years	5 years
Shareholder percent ownership of the company						10.00%
Employee stock purchase plan shares reserved for issuance						225,000
Shares issued under employee stock purchase plan																								18,000
Purchase price as percent of fair market value						85.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount																								$ 22,000
Fair Value Assumptions, Risk Free Interest Rate																								1.75%
Fair Value Assumptions, Expected Volatility Rate																								1.301%
Expected Forfeiture Rate																								21.98%
Fair Value Assumptions, Expected Dividend yield																								0.00%
Shares vest																									4,500	4,500	4,500	4,500
Maximum number of shares per employee per year						5,000
Maximum term of options and stock appreciation rights														10 years
Maximum number of shares issuable other than options														325,000
Minimum stock appreciation rights percent of market value														100.00%