Note 5. Held to Maturity Securities (Detail) - Summary of the Portfolio of the Bank's Held to Maturity Securities Portfolio Which Has Gross Unrealized Losses (USD $)	Jun. 30, 2012	Dec. 31, 2011
Fair Value	$ 34,779,290	$ 27,540,742
Unrealized Losses	92,262	99,230
Fair Value	34,779,290	27,540,742
Unrealized Losses	92,262	99,230
US States and Political Subdivisions Debt Securities [Member]
Fair Value	2,007,671	979,394
Unrealized Losses	26,415	3,892
Fair Value	2,007,671	979,394
Unrealized Losses	26,415	3,892
Collateralized Mortgage Obligations [Member]
Fair Value	8,708,838	11,163,181
Unrealized Losses	40,460	81,226
Fair Value	8,708,838	11,163,181
Unrealized Losses	40,460	81,226
Mortgage-backed Securities, Issued by Private Enterprises [Member]
Fair Value	24,062,781	5,403,167
Unrealized Losses	25,387	9,112
Fair Value	24,062,781	5,403,167
Unrealized Losses	25,387	9,112
US Government-sponsored Enterprises Debt Securities [Member]
Fair Value		9,995,000
Unrealized Losses		5,000
Fair Value		9,995,000
Unrealized Losses		$ 5,000