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Note 19 - Unaudited Supplementary Data (Tables)
 12 Months Ended
Nov. 30, 2017
Notes Tables  
Quarterly Financial Information [Table Text Block]
    2017
    Q1   Q2   Q3   Q4
Loss from operations   $
(8,963
 )   $
(7,558
 )   $
(8,423
 )   $
(8,753
 )
Net loss   $
(10,143
 )   $
(8,462
 )   $
(10,393
 )   $
(10,018
 )
Loss per common share, basic and diluted   $
(0.03
 )   $
(0.03
 )   $
(0.03
 )   $
(0.03
 )
    2016
    Q1   Q2   Q3   Q4
Loss from operations   $
(9,530
 )   $
(7,391
 )   $
(6,422
 )   $
(6,804
 )
Net loss   $
(9,977
 )   $
(9,138
 )   $
(7,381
 )   $
(7,350
 )
Loss per common share, basic and diluted   $
(0.03
 )   $
(0.03
 )   $
(0.02
 )   $
(0.02
 )