Stockholders' Equity - Stock Option Grants, Activity And Expense (Details) $ / shares in Units, $ in Thousands			3 Months Ended			12 Months Ended
	Mar. 09, 2020 shares	Mar. 03, 2020 shares	Feb. 29, 2020 USD ($) individual $ / shares shares	May 31, 2019 $ / shares shares	Feb. 28, 2019 USD ($) $ / shares shares	Nov. 30, 2021 shares	Mar. 31, 2020 shares
Other Disclosures
Number of option holders | individual			26
Unrecognized compensation expense related to non-vested stock options that will be recognized during future periods
Balance of Fiscal 2020 | $			$ 122
Fiscal 2021 | $			$ 39
Activity under the 2009 Stock Option Plan
Outstanding at beginning of period (in shares)			189,822	222,252	224,001
Forfeited (in shares)					(1,749)
Outstanding at end of period (in shares)			189,822		222,252
Weighted Avg. Exercise Price
Outstanding at beginning of period (in dollars per share) | $ / shares			$ 28.23	$ 28.15	$ 28.20
Forfeited (in dollars per share) | $ / shares					34.30
Outstanding at end of period (in dollars per share) | $ / shares			$ 28.23		$ 28.15
2009 Stock Option Plan
2009 Stock Option Plan
Expiration term			10 years
Number of options that may be exercised as stock appreciation rights			0
Compensation expense for stock options
Compensation expense (benefit) | $			$ 57		$ 90
Related tax benefit (expense) | $			$ 9		$ 13
2009 Stock Option Plan | Minimum
Compensation expense for stock options
Forfeiture rates (as a percent)			0.00%		0.00%
2009 Stock Option Plan | Minimum | Executives
Compensation expense for stock options
Forfeiture rates (as a percent)			17.90%	17.90%
2009 Stock Option Plan | Minimum | Employee
Compensation expense for stock options
Forfeiture rates (as a percent)			38.30%	38.30%
2009 Stock Option Plan | Maximum
Compensation expense for stock options
Forfeiture rates (as a percent)			2.00%	2.00%
2009 Stock Option Plan | Subsequent events
2009 Stock Option Plan
Granted (in shares)		48,000				50,000
Activity under the 2009 Stock Option Plan
Granted (in shares)		48,000				50,000
2020 Incentive Award Plan | Subsequent events
2009 Stock Option Plan
Number of shares authorized							300,000
Granted (in shares)		52,000
Activity under the 2009 Stock Option Plan
Granted (in shares)		52,000
Exercised (in shares)	(53,293)