Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.5.0.2
Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Stock Compensation Plan [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Stock based compensation expense $ 199 $ 151 $ 228 $ 357
Income tax benefit to stock based compensation $ 71 $ 53 $ 81 $ 126
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]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Options, stock awards and performance awards available for future grants 309,000   309,000  
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   1,375,000  
Amended and Restated 2000 Incentive Plan [Member] | Restricted Stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Available for future awards under the plan 225,000   225,000  
Restricted stock awarded 0 0 82,000 34,000
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     43,000 15,000
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     31,000 12,000
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     8,000 7,000
Share-based compensation vesting percentage     100.00%  
Vesting period     1 year  
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 0 0 0
Employee Stock Purchase Plan        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Discount on purchase price of common stock percentage on fair market value     15.00%  
Stock based compensation (income) expense $ (7) $ 8 $ 6 $ 22
Income tax (expense) benefits to stock based compensation $ (3) $ 3 $ 2 $ 8