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Business Segment Information (Tables)
3 Months Ended
Oct. 31, 2014
Business Segment Information [Abstract]  
Summary of operating results for the business segments

  Straight Path 
Spectrum
  Straight Path 
IP
  Total 
  (in thousands) 
Three Months Ended October 31, 2014         
Revenues $96  $4,727  $4,823 
Income (loss) from operations  (297)  1,909   1,612 
Three Months Ended October 31, 2013            
Revenues $107  $20  $127 
Loss from operations  (60)  (410)  (470)
Summary of total assets for the business segments

  Straight Path 
Spectrum
  Straight Path 
IP
  Total 
     (in thousands)    
Total assets:         
October 31, 2014 (unaudited) $5,399  $23,732  $29,131 
July 31, 2014  5,586   24,853   30,439