Annual report pursuant to Section 13 and 15(d)

Equity Compensation Plans - Additional Information (Detail)

v3.20.1
Equity Compensation Plans - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Cash proceeds from the exercise of stock options $ 24 $ 307 $ 0
Total intrinsic value of the stock options exercised 10 $ 161 0
Options, stock awards and performance awards available for future grants   202,000  
Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense 945 $ 1,069 577
Income tax benefit to stock based compensation $ 208 $ 237 $ 125
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awarded 83,000 53,000 59,000
Unrecognized stock-based compensation expense $ 2,318    
Weighted average period for recognize expense 1 year 4 months 17 days    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options maximum term 10 years    
Amended and Restated 2000 Incentive Plan [Member] | Stock Compensation Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 1,375,000    
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock awarded 83,000 53,000 59,000
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 40,000 27,000 30,000
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 28,000 20,000 22,000
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 15,000 6,000 7,000
Share-based compensation vesting percentage 100.00%    
Vesting period 1 year    
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 467,000    
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    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based compensation expense $ 30 $ 0 $ 0
Income tax benefit to stock based compensation $ 7 $ 0 $ 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 9,000 6,000 7,000
Common stock may be purchased 200,000