Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Detail) - Restricted stock awards

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Stockholders' equity (Detail) - Restricted stock awards (USD $)
12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Outstanding at beginning of year (in Shares) 311,952 417,578 377,400
Outstanding at beginning of year $ 4.84 $ 5.50 $ 6.05
Awarded (in Shares) 144,143 181,643 241,610
Awarded $ 2.51 $ 3.78 $ 5.54
Vested (in Shares) (174,638) (263,112) (192,845)
Vested $ (4.85) $ 5.11 $ 6.46
Forfeited (in Shares) (23,874) (24,157) (8,587)
Forfeited $ (4.30) $ 5.27 $ 9.29
Outstanding at end of year (in Shares) 257,583 311,952 417,578
Outstanding at end of year $ 3.58 $ 4.84 $ 5.50
Weighted average market value of awards granted during year $ 2.51 $ 3.78 $ 5.54