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Stockholders' Equity - Stock Repurchases, Cash Dividend (Details) - USD ($)
12 Months Ended 24 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2017
Stock Repurchases        
Stock repurchased     $ 1,474,000  
Cash Dividends        
Cash dividends declared (in dollars per share) $ 0.50 $ 0.45 $ 0.40  
Cash dividend paid $ 2,279,000 $ 2,000,000 $ 1,514,000  
Stock Repurchases        
Stock Repurchases        
Stock repurchase program, authorized amount     $ 5,000,000 $ 5,000,000
Stock repurchased (in shares)   47,173   152,173
Stock repurchased   $ 1,474,000   $ 4,828,000