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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2015
Supplemental Cash Flow Information [Abstract]      
Cash interest paid $ 2,715 $ 1,941 $ 677
Income taxes paid 2 80 8
Noncash financing and investing activity:      
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions 50 105 169
Noncash reclass from inventory to project assets 7,282    
Assumption of debt in conjunction with asset acquisition 2,289    
Acquisition of project assets 2,386    
Accrued sale of common stock, cash received in a subsequent period   357 $ 494
Accrued purchase of fixed assets, cash paid in subsequent period 2,490 3,952  
Accrued purchase of project assets, cash paid in subsequent period $ 2,380 $ 1,797