Annual report pursuant to Section 13 and 15(d)

Equity Compensation Plans - Additional Information (Detail)

v3.21.1
Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Aug. 11, 2020
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Cash proceeds from the exercise of stock options   $ 0 $ 24 $ 307
Total intrinsic value of the stock options exercised   $ 0 10 161
Options, stock awards and performance awards available for future grants   453,000    
Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense   $ 817 945 1,069
Income tax benefit to stock based compensation   $ 193 $ 208 $ 237
Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards granted   0 0 0
Stock options maximum term   10 years    
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awarded   113,000 83,000 53,000
Unrecognized stock-based compensation expense   $ 1,877    
Weighted average period for recognize expense   1 year 8 months 1 day    
2020 Equity Incentive Plan [Member] | Stock Compensation Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized   422,000    
Amended and Restated 2000 Incentive Plan [Member] | Stock Compensation Prior Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Remaining available shares under equity based compensation plan   112,000    
Amended and Restated 2000 Incentive Plan [Member] | Employee Stock Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock option awards granted 0      
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awarded   113,000 83,000 53,000
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Performance Vested Restricted Stock [Member] | Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awarded   54,000 40,000 27,000
Share-based compensation vesting percentage   100.00%    
Vesting period   3 years    
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Officers and Key Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awarded   38,000 28,000 20,000
Share-based compensation vesting percentage   33.33%    
Vesting period   3 years    
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Time Vested Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock awarded   21,000 15,000 6,000
Share-based compensation vesting percentage   100.00%    
Vesting period   1 year    
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense   $ 47 $ 30 $ 0
Income tax benefit to stock based compensation   $ 11 $ 7 $ 0
Maximum discount on purchase price of common stock percentage on fair market value   15.00%    
Issue of treasury stock to the ESPP for the offering periods   21,000 9,000 6,000
Common stock may be purchased   200,000