Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Total
Balance at beginning of period at Nov. 30, 2016	$ 55	$ 108,438	$ 179	$ (1,049)	$ (16,820)	$ 90,803
Balance (in shares) at Nov. 30, 2016	5,541,029
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		260				260
Repurchase of common stock					(1,474)	(1,474)
Net income (loss)			5,117			5,117
Total other comprehensive income (loss), net of tax				(699)		(699)
Balance at end of period at Aug. 31, 2017	$ 55	108,698	5,296	(1,748)	(18,294)	94,007
Balance (in shares) at Aug. 31, 2017	5,541,029
Balance at beginning of period at Nov. 30, 2017	$ 55	108,770	2,806	(284)	(18,294)	93,053
Balance (in shares) at Nov. 30, 2017	5,541,029
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		261				261
Exercise of stock options, including shares tendered related to stock options exercised and tax witholdings	$ 1	2,383			(1,189)	1,195
Exercise of stock options, including and shares tendered related to stock options exercised and tax witholdings (in shares)	74,554
Net income (loss)			(1,514)			(1,514)
Total other comprehensive income (loss), net of tax				2,523		2,523
Balance at end of period at Aug. 31, 2018	$ 56	$ 111,414	2,207	2,203	$ (19,483)	96,397
Balance (in shares) at Aug. 31, 2018	5,615,583
Increase (Decrease) in Stockholders' Equity
Adoption of ASU | ASU 2016-09			879			$ 879
Adoption of ASU | ASU 2018-02			$ 36	$ (36)