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		170				170
Repurchase of common stock					(1,474)	(1,474)
Net income (loss)			3,788			3,788
Total other comprehensive income (loss), net of tax				(6)		(6)
Balance at end of period at May. 31, 2017	$ 55	108,608	3,967	(1,055)	(18,294)	93,281
Balance (in shares) at May. 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		178				178
Exercise of stock options, including tax benefit of $46 and shares tendered related to stock options exercised and tax witholdings	$ 1	1,208			(721)	488
Exercise of stock options, including tax benefit of $46 and shares tendered related to stock options exercised and tax witholdings (in shares)	36,823
Net income (loss)			(1,392)			(1,392)
Total other comprehensive income (loss), net of tax				2,294		2,294
Balance at end of period at May. 31, 2018	$ 56	$ 110,156	2,329	1,974	$ (19,015)	95,500
Balance (in shares) at May. 31, 2018	5,577,852
Increase (Decrease) in Stockholders' Equity
Adoption of ASU | ASU 2016-09			879			$ 879
Adoption of ASU | ASU 2018-02			$ 36	$ (36)