Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, beginning		211,185	190,419
Granted, shares		29,500	28,500
Forfeited, shares		(13,787)
Exercised, shares		0	0
Expired, shares		(8,598)	(7,734)
Options outstanding, ending		218,300	211,185	190,419
Options outstanding, beginning, Weighted Average Exercise Price		$ 6.57	$ 7.02
Options exercisable, ending		218,300
Granted, Weighted Average Exercise Price		$ 7.24	5.65
Forfeited, Weighted Average Exercise Price		5.90
Exercised, Weighted Average Exercise Price		0	0
Expired, Weighted Average Exercise Price		12.84	14.43
Options outstanding, ending, Weighted Average Exercise Price		6.35	$ 6.57	$ 7.02
Options exercisable, ending, Weighted Average Exercise Price		$ 6.35
Options outstanding, ending, Weighted Average Remaining Contractual Life		5 years 10 months 24 days	6 years	6 years 2 months 12 days
Options exercisable, ending, Weighted Average Remaining Contractual Life		5 years 10 months 24 days
Options outstanding, ending, Aggregate Intrinsic Value	[1]	$ 378,288	$ 81,248
Options exercisable, ending, Aggregate Intrinsic Value	[1]	$ 378,288

[1] The aggregate intrinsic value of a stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on December 31, 2016. This amount changes based on changes in the market value of the Company's common stock.