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, 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 withholdings	$ 1	856			(846)	11
Exercise of stock options, including shares tendered related to stock options exercised and tax withholdings (in shares)	29,838
Net (loss) income			6,250			6,250
Total other comprehensive 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
Balance at beginning of period at May. 31, 2019	$ 57	113,111	5,022	(1,791)	(20,329)	96,070
Balance (in shares) at May. 31, 2019	5,665,544
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		21				21
Net (loss) income			1,017			1,017
Total other comprehensive loss, net of tax				(2,639)		(2,639)
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
Balance at beginning of period at Nov. 30, 2019	$ 57	113,256	919	(3,141)	(20,329)	90,762
Balance (in shares) at Nov. 30, 2019	5,668,043
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		385				385
Exercise of stock options, including shares tendered related to stock options exercised and tax withholdings		1,289			(1,079)	210
Exercise of stock options, including shares tendered related to stock options exercised and tax withholdings (in shares)	44,900
Sale of Common stock	$ 5	23,037				23,042
Sale of common stock	557,883
Net (loss) income			(1,654)			(1,654)
Total other comprehensive loss, net of tax				(4,721)		(4,721)
Balance at end of period at Aug. 31, 2020	$ 62	137,967	(735)	(7,862)	(21,408)	108,024
Balance (in shares) at Aug. 31, 2020	6,270,826
Balance at beginning of period at May. 31, 2020	$ 57	116,096	(94)	(8,066)	(20,329)	87,664
Balance (in shares) at May. 31, 2020	5,724,070
Increase (Decrease) in Stockholders' Equity
Stock-based compensation expense		125				125
Exercise of stock options, including shares tendered related to stock options exercised and tax withholdings		1,209			(1,079)	130
Exercise of stock options, including shares tendered related to stock options exercised and tax withholdings (in shares)	42,166
Sale of Common stock	$ 5	20,537				20,542
Sale of common stock	504,590
Net (loss) income			(641)			(641)
Total other comprehensive loss, net of tax				204		204
Balance at end of period at Aug. 31, 2020	$ 62	$ 137,967	$ (735)	$ (7,862)	$ (21,408)	$ 108,024
Balance (in shares) at Aug. 31, 2020	6,270,826