Stock-Based Compensation Plans (Schedule Of Changes In Non-Vested Option Shares) (Details) - 2010 Plan [Member] - Stock Options [Member]	3 Months Ended
	Oct. 31, 2016 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Options, Non-vested, Beginning Balance | shares	70,000
Number of Options, Granted | shares
Number of Options, Vested | shares	(6,250)
Number of Options, Forfeited | shares	(13,750)
Number of Options, Non-vested, Ending Balance | shares	50,000
Weighted Average Exercise Price, Non-vested, Beginning Balance | $ / shares	$ 3.29
Weighted Average Exercise Price, Granted | $ / shares
Weighted Average Exercise Price, Vested | $ / shares	3.20
Weighted Average Exercise Price, Forfeited | $ / shares	3.31
Weighted Average Exercise Price, Non-vested, Ending Balance | $ / shares	$ 3.29