Securities - Aggregate Amortized Costs and Fair Values of the Available-for-Sale Securities Portfolio (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 41,094,699	$ 36,277,498
Gross Unrealized Gains	136,767	494,208
Gross Unrealized (Losses)	(1,181,053)	(71,186)
Fair Value	40,050,413	36,700,520	[1]
U. S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,690,312	9,411,627
Gross Unrealized Gains	15,727	78,178
Gross Unrealized (Losses)	(43,701)	(25,990)
Fair Value	9,662,338	9,463,815
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	28,339,387	23,480,871
Gross Unrealized Gains	113,600	412,759
Gross Unrealized (Losses)	(1,086,313)	(44,102)
Fair Value	27,366,674	23,849,528
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,985,000	1,985,000
Gross Unrealized Gains	7,440	3,271
Gross Unrealized (Losses)	(3,039)	(1,094)
Fair Value	1,989,401	1,987,177
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,080,000	1,400,000
Gross Unrealized (Losses)	(48,000)
Fair Value	$ 1,032,000	$ 1,400,000

[1] Derived from the audited consolidated financial statements.