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Stockholders' Equity (Tables)
 12 Months Ended
Jul. 31, 2017
Stockholders' Equity Note [Abstract]  
Share-based Compensation, Stock Options, Activity [Table Text Block] A summary of the activity pursuant to the Company’s stock option plans for the years ended July 31, 2017, 2016, and 2015 is as follows:

   2017   2016   2015 
   Options   Weighted -
Average
Exercise
Price		   Options   Weighted -
Average
Exercise
Price		   Options   Weighted -
Average
Exercise
Price		 
Outstanding at beginning of year   1,808,875   $3.43    1,358,104   $3.04    1,155,910   $5.03 
New Grants   496,996   $7.07    490,473   $4.48    383,873   $3.55 
Exercised   (141,876)  $3.19    (33,702)  $2.81    —   $— 
Expired   (33,000)  $5.29    (6,000)  $3.61    (181,679)  $16.84 
Outstanding at end of year   2,130,995   $4.26    1,808,875   $3.43    1,358,104   $3.04 
Exercisable at end of year   1,388,475   $3.27    1,094,794   $2.95    782,688   $2.88 
Weighted average fair value of
options granted during year		       $2.43        $1.58        $1.36 
Schedule of Share based Compensation Stock Options Activity Range of Exercise Prices [Table Text Block] The following table summarizes information for stock options outstanding at July 31, 2017:

   Options outstanding and exercisable 
Range of Exercise prices  Shares   Weighted-Average
Remaining Contractual
Life in Years		   Weighted-Average
Exercise Price		 
$2.53 - $4.35   1,425,460    1.13   $3.25 
$4.66 - $7.07   705,535    1.35   $6.31 
    2,130,995           
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] The following table summarizes the activity pursuant to restricted stock awards for the years ended July 31,

   2017   2016   2015 
   Awards   Weighted -
Average
Award Price		   Awards   Weighted -
Average
Award Price		   Awards   Weighted -
Average
Award Price		 
Outstanding at beginning of year   8,501   $4.13    21,501   $8.84    42,502   $5.74 
Awarded   4,250   $6.95    —   $—    4,250   $4.75 
Vested   (5,140)  $(4.10)   (11,500)  $(2.83)   (19,418)  $(2.83)
Forfeited   (175)  $(2.14)   (1,500)  $(2.86)   (5,833)  $(3.22)
Outstanding (non-vested) at end of year   7,436   $4.45    8,501   $4.13    21,501   $8.84 
Weighted average market value of awards granted during year       $6.95        $—        $4.75