Stockholders' Equity - Stock Repurchases, Cash Dividend (Details) - USD ($)			12 Months Ended
	Oct. 20, 2016	May 27, 2016	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014	Mar. 31, 2016
Stock Repurchases
Stock repurchase program, authorized amount			$ 5,000,000
Stock repurchased			3,354,000
Cash Dividend
Cash dividend paid			$ 1,546,000	$ 1,030,000	$ 1,029,000
Cash dividends declared (in dollars per share)			$ 0.30	$ 0.30	$ 0.20
Common Stock
Stock Repurchases
Stock repurchase program, authorized amount						$ 5,000
Stock repurchased (in shares)	45,000	60,000
Stock repurchased	$ 1,403,000	$ 1,951,000