Employee Benefit Plans - Components of Net Periodic Benefit Cost (Gain) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost		$ 254,285
Interest cost	143,259	178,298
Expected (return) on plan assets	(214,661)	(321,864)
Amortization of prior service cost		(755,465)
Recognized net loss due to settlement	113,527	534,220
Recognized net actuarial loss	89,745	71,440
Net periodic benefit cost (gain)	131,870	(39,086)
Other Postretirement Benefit Plan, Defined Benefit
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost	22,950	26,002
Interest cost	29,906	29,957
Amortization of net obligation at transition	2,913	2,913
Recognized net actuarial loss	4,496	2,942
Net periodic benefit cost (gain)	$ 60,265	$ 61,814