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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Apr. 30, 2015
Apr. 26, 2007
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares, Granted 0 2,192      
Weighted average remaining life for outstanding stock 3 years 9 months 18 days        
Exercise price range, lower range limit $ 1.20        
Exercise price range, upper range limit $ 5.89        
Stock Option [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Option expiry term (Years) 10 years        
Stock-based compensation expense $ 3,000 $ 6,000      
Expected additional expense for 2016 5,000        
Expected additional expense for 2017 $ 1,000        
Weighted-average recognition period of nonvested stock options expense 1 year 3 months        
Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 215,000 190,000      
Expected additional expense for 2016 667,000        
Expected additional expense for 2017 $ 549,000        
Nonvested shares 370,510   260,490    
Vested shares during 2016 67,103        
Vested shares during 2017 127,316        
Vested shares during 2018 97,224        
Vested shares during 2019 78,867        
Expected additional expense for 2018 $ 383,000        
Expected additional expense for 2019 $ 102,000        
Total average per share value of shares vested $ 5.70        
2015 Long Term Incentive Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum       1,200,000  
2007 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum         2,000,000
1999 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum 3,569,766        
Executive Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Percentage of amount paid in cash 80.00%        
Percentage of amount paid in restricted stock 20.00%        
Executive Incentive Plan [Member] | Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 76,000 68,000      
Executive Incentive Plan [Member] | Restricted Stock [Member] | Beginning on first anniversary of issue date [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation vesting period 3 years        
Executive Incentive Plan [Member] | Cash Portion [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 325,000 168,000      
Long Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 96,000 $ 48,000