Annual report pursuant to Section 13 and 15(d)

Property, plant, and equipment (Tables)

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Property, plant, and equipment (Tables)
 12 Months Ended
Jul. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment [Table Text Block] At July 31, 2018 and 2017 property, plant, and equipment consist of:

    2018     2017  
Building and building improvements   $ 4,917     $ 4,898  
Machinery and equipment (includes asset under capital lease - see Note 9)     7,570       7,878  
Office furniture and computer equipment     15,362       19,434  
Leasehold improvements     5,262       5,389  
      33,111       37,599  
Accumulated depreciation and amortization     (26,187 )     (30,410 )
      6,924       7,189  
Land and land improvements     712       712  
    $ 7,636     $ 7,901