7. Carrying Amounts and Fair Value of Financial Instruments: Fair Value, Assets Measured on Recurring Basis (Details) (Fair Value, Inputs, Level 2, USD $)	Sep. 30, 2012	Mar. 31, 2012
Assets, Fair Value Disclosure, Recurring	$ 359,820,610	$ 353,954,857
FHLB Securities
Assets, Fair Value Disclosure, Recurring	4,324,400	2,698,894
SBA Bonds
Assets, Fair Value Disclosure, Recurring	89,495,776	86,278,802
Tax Exempt Municipal Bonds
Assets, Fair Value Disclosure, Recurring	34,211,292	24,125,725
Mortgage-Backed Securities
Assets, Fair Value Disclosure, Recurring	231,713,392	237,853,835
Equity Securities
Assets, Fair Value Disclosure, Recurring	75,750	75,750
FNMA and FHLMC Bonds
Assets, Fair Value Disclosure, Recurring		$ 2,921,851