Note 7. Allowance for Loan Losses (Detail) - Allowance for Loan Losses (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Balance at beginning of period	$ 11,849,317	$ 9,870,254	$ 11,012,088	$ 9,526,592	$ 9,526,592
Net loans charged-off	(1,783,118)	(1,915,871)	(2,445,889)	(2,972,209)
Additions to ALL charged to expense	1,500,000	1,920,000	3,000,000	3,320,000
Balance at end of period	11,566,199	9,874,383	11,566,199	9,874,383	11,012,088
Charge-offs	(1,850,714)	(1,968,395)	(2,835,160)	(3,051,523)	(7,127,898)
Recoveries	$ 67,596	$ 52,524	$ 389,271	$ 79,314	$ 243,394