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Nature of Business and Summary of Significant Accounting Policies (Summary of Allowances) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
SEC Schedule, 12-09, Allowance, Credit Loss      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance $ 498 $ 741 $ 1,421
Charge (credit) to costs and expenses 216 204 (256)
Write-offs and other (232) (437) (370)
Translation adjustments 4 (10) (54)
Ending balance 486 498 741
Allowance for Sales Credit Memos      
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Beginning balance 178 402 772
Charge (credit) to costs and expenses 46 (158) (223)
Write-offs and other 0 (69) (144)
Translation adjustments 0 3 (3)
Ending balance $ 224 $ 178 $ 402