Securities - Unrealized Loss Positions (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	$ 20,272,064	$ 4,686,450
Less than 12 months, Unrealized Loss	1,171,855	64,815
12 months or more, Fair Value	1,026,974	1,037,825
12 months or more, Unrealized Loss	9,198	6,371
Fair Value, Total	21,299,038	5,724,275
Total Unrealized Loss	1,181,053	71,186
U. S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	5,367,622	1,080,438
Less than 12 months, Unrealized Loss	43,701	25,990
12 months or more, Fair Value
12 months or more, Unrealized Loss
Fair Value, Total	5,367,622	1,080,438
Total Unrealized Loss	43,701	25,990
State and Municipal Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	13,379,481	2,863,106
Less than 12 months, Unrealized Loss	1,077,115	37,731
12 months or more, Fair Value	1,026,974	1,037,825
12 months or more, Unrealized Loss	9,198	6,371
Fair Value, Total	14,406,455	3,900,931
Total Unrealized Loss	1,086,313	44,102
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	492,961	742,906
Less than 12 months, Unrealized Loss	3,039	1,094
12 months or more, Fair Value
12 months or more, Unrealized Loss
Fair Value, Total	492,961	742,906
Total Unrealized Loss	3,039	1,094
Auction Rate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 months, Fair Value	1,032,000
Less than 12 months, Unrealized Loss	48,000
12 months or more, Fair Value
12 months or more, Unrealized Loss
Fair Value, Total	1,032,000
Total Unrealized Loss	$ 48,000