5. Changes in the allowance for loan losses (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Allowance for loan losses, Beginning balance	$ 3,926,119	$ 3,851,369	$ 3,886,502	$ 3,727,935	$ 3,727,935
Charge-offs	(111,834)	(342,245)	(595,958)	(680,930)	(941,673)
Recoveries	50,946	39,216	74,685	76,335	100,240
Provisions	249,999	287,500	750,001	712,500	1,000,000
Allowance for loan losses, Ending balance	4,115,230	3,835,840	4,115,230	3,835,840	3,886,502
Allowance for loan losses evaluated for impairment, Individually	166,000	499,200	166,000	499,200	458,500
Allowance for loan losses evaluated for impairment, Collectively	3,949,230	3,336,640	3,949,230	3,336,640	3,428,002
Total Allowance for loan losses	4,115,230	3,835,840	4,115,230	3,835,840	3,886,502
Loans evaluated for impairment, Individually	4,192,714	6,568,494	4,192,714	6,568,494	7,470,370
Loans evaluated for impairment, Collectively	403,417,991	381,980,370	403,417,991	381,980,370	378,916,102
Total Loans	407,610,705	388,548,864	407,610,705	388,548,864	386,386,472
Commercial and industrial
Allowance for loan losses, Beginning balance	383,523	246,567	342,314	302,421	302,421
Charge-offs	(34,375)	(18,924)	(159,309)	(22,050)	(22,050)
Recoveries	17,978	1,144	20,498	12,665	13,225
Provisions	51,298	51,343	214,921	(12,906)	48,718
Allowance for loan losses, Ending balance	418,424	280,130	418,424	280,130	342,314
Allowance for loan losses evaluated for impairment, Individually	0	42,100	0	42,100	70,600
Allowance for loan losses evaluated for impairment, Collectively	418,424	238,030	418,424	238,030	271,714
Total Allowance for loan losses	418,424	280,130	418,424	280,130	342,314
Loans evaluated for impairment, Individually	446,484	841,032	446,484	841,032	1,000,120
Loans evaluated for impairment, Collectively	47,038,155	33,729,031	47,038,155	33,729,031	38,514,487
Total Loans	47,484,639	34,570,063	47,484,639	34,570,063	39,514,607
Commercial real estate
Allowance for loan losses, Beginning balance	1,386,183	1,395,350	1,385,939	1,391,898	1,391,898
Charge-offs	(2,821)	(21,679)	(57,878)	(21,679)	(197,367)
Recoveries	24,587	4,241	25,450	6,422	8,479
Provisions	36,941	148,745	91,379	150,016	182,929
Allowance for loan losses, Ending balance	1,444,890	1,526,657	1,444,890	1,526,657	1,385,939
Allowance for loan losses evaluated for impairment, Individually	8,900	104,500	8,900	104,500	57,500
Allowance for loan losses evaluated for impairment, Collectively	1,435,990	1,422,157	1,435,990	1,422,157	1,328,439
Total Allowance for loan losses	1,444,890	1,526,657	1,444,890	1,526,657	1,385,939
Loans evaluated for impairment, Individually	2,187,060	2,834,584	2,187,060	2,834,584	3,669,260
Loans evaluated for impairment, Collectively	133,829,494	135,057,665	133,829,494	135,057,665	128,600,108
Total Loans	136,016,554	137,892,249	136,016,554	137,892,249	132,269,368
Residential real estate 1st lien
Allowance for loan losses, Beginning balance	1,473,661		1,578,493
Charge-offs	(56,126)		(239,600)		(521,608)
Recoveries	1,426		3,248		42,593
Provisions	85,324		162,144		226,692
Allowance for loan losses, Ending balance	1,504,285		1,504,285		1,578,493
Allowance for loan losses evaluated for impairment, Individually	110,700		110,700		283,200
Allowance for loan losses evaluated for impairment, Collectively	1,393,585		1,393,585		1,295,293
Total Allowance for loan losses	1,504,285		1,504,285		1,578,493
Loans evaluated for impairment, Individually	1,261,272		1,261,272		2,366,326
Loans evaluated for impairment, Collectively	165,796,198		165,796,198		154,884,065
Total Loans	167,057,470		167,057,470		157,250,391
Residential Real Estate Jr Lien
Allowance for loan losses, Beginning balance	368,939		331,684	0	0
Charge-offs	(9,447)		(69,734)		(96,961)
Recoveries	60		1,479		20
Provisions	38,815		134,938		428,625
Allowance for loan losses, Ending balance	398,367		398,367		331,684
Allowance for loan losses evaluated for impairment, Individually	46,400		46,400		47,200
Allowance for loan losses evaluated for impairment, Collectively	351,967		351,967		284,484
Total Allowance for loan losses	398,367		398,367		331,684
Loans evaluated for impairment, Individually	297,898		297,898		434,664
Loans evaluated for impairment, Collectively	45,731,340		45,731,340		45,452,303
Total Loans	46,029,238		46,029,238		45,886,967
Residential Real Estate
Allowance for loan losses, Beginning balance		1,965,940		1,830,816	1,830,816
Charge-offs		(291,077)		(562,524)
Recoveries		27,355		27,955
Provisions		129,545		535,516
Allowance for loan losses, Ending balance		1,831,763		1,831,763
Allowance for loan losses evaluated for impairment, Individually		352,600		352,600
Allowance for loan losses evaluated for impairment, Collectively		1,479,163		1,479,163
Total Allowance for loan losses		1,831,763		1,831,763
Loans evaluated for impairment, Individually		2,892,878		2,892,878
Loans evaluated for impairment, Collectively		201,294,086		201,294,086
Total Loans		204,186,964		204,186,964
Consumer Portfolio Segment [Member]
Allowance for loan losses, Beginning balance	126,914	132,532	124,779	151,948	151,948
Charge-offs	(9,065)	(10,565)	(69,437)	(74,677)	(103,687)
Recoveries	6,895	6,476	24,010	29,293	35,923
Provisions	5,965	615	51,357	22,494	40,595
Allowance for loan losses, Ending balance	130,709	129,058	130,709	129,058	124,779
Allowance for loan losses evaluated for impairment, Individually	0	0	0	0	0
Allowance for loan losses evaluated for impairment, Collectively	130,709	129,058	130,709	129,058	124,779
Total Allowance for loan losses	130,709	129,058	130,709	129,058	124,779
Loans evaluated for impairment, Individually	0	0	0	0	0
Loans evaluated for impairment, Collectively	11,022,804	11,899,588	11,022,804	11,899,588	11,465,139
Total Loans	11,022,804	11,899,588	11,022,804	11,899,588	11,465,139
Unallocated
Allowance for loan losses, Beginning balance	186,899	110,980	123,293	50,852	50,852
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0	0
Provisions	31,656	(42,748)	95,262	17,380	72,441
Allowance for loan losses, Ending balance	218,555	68,232	218,555	68,232	123,293
Allowance for loan losses evaluated for impairment, Individually	0	0	0	0	0
Allowance for loan losses evaluated for impairment, Collectively	218,555	68,232	218,555	68,232	123,293
Total Allowance for loan losses	$ 218,555	$ 68,232	$ 218,555	$ 68,232	$ 123,293