Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
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 withholdings (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)
Balance at beginning of period at Nov. 30, 2018	$ 56	112,071	(211)	2,395	(19,483)	94,828
Balance (in shares) at Nov. 30, 2018	5,635,706
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		205				205
Exercise of stock options, including shares tendered related to stock options exercised and tax witholdings	$ 1	856			(846)	11
Exercise of stock options, including and shares tendered related to stock options exercised and tax withholdings (in shares)	29,838
Net income (loss)			6,250			6,250
Total other comprehensive income (loss), net of tax				(6,825)		(6,825)
Balance at end of period at Aug. 31, 2019	$ 57	$ 113,132	$ 6,039	$ (4,430)	$ (20,329)	$ 94,469
Balance (in shares) at Aug. 31, 2019	5,665,544