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Stockholders' Equity - Stock Repurchases, Cash Dividend (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Feb. 28, 2017
Feb. 29, 2016
May 31, 2017
May 31, 2016
Nov. 30, 2016
May 11, 2016
Stock Repurchases            
Stock repurchased     $ 1,474 $ 1,951    
Cash Dividend            
Cash dividend paid $ 1,514 $ 1,546 $ 1,514 $ 1,546    
Cash dividends declared (in dollars per share)     $ 0 $ 0    
Stock Repurchases            
Stock Repurchases            
Stock repurchase program, authorized amount           $ 5,000
Stock repurchased (in shares)     47,173   152,173  
Stock repurchased     $ 1,474   $ 4,828