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Equity Compensation Plans - Additional Information (Detail)
3 Months Ended
Jun. 30, 2018
USD ($)
shares
Employee Stock Option Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Intrinsic value of options outstanding $ 0
Restricted Stock [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Restricted stock grants | shares 7,500
Restricted stock vesting period 1 year
Restricted stock grant date fair value $ 165,375
Restricted stock cost 13,781
Restricted stock, deferred taxes 3,438
Directors Stock Option Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Intrinsic value of options outstanding 141,570
2013 Plan [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Intrinsic value of options outstanding $ 0