Annual report pursuant to Section 13 and 15(d)

Stockholders' equity (Details) - Schedule of Restricted stock awards

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Stockholders' equity (Details) - Schedule of Restricted stock awards (USD $)
12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Schedule of Restricted stock awards [Abstract]      
Outstanding at beginning of year (in Shares) 257,583 311,952 417,578
Outstanding at beginning of year $ 3.58 $ 4.84 $ 5.50
Awarded (in Shares) 39,000 144,143 181,643
Awarded $ 1.77 $ 2.51 $ 3.78
Vested (in Shares) (157,783) (174,638) (263,112)
Vested $ (3.23) $ (4.85) $ (5.11)
Forfeited (in Shares) (13,667) (23,874) (24,157)
Forfeited $ (3.59) $ (4.30) $ (5.27)
Outstanding at end of year (in Shares) 125,133 257,583 311,952
Outstanding at end of year $ 3.45 $ 3.58 $ 4.84
Weighted average market value of awards granted during year $ 1.77 $ 2.51 $ 3.78