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4. Mortgage-backed Securities: Mortgage-Backed Securities Available for Sale (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Mortgage-Backed Securities Available for Sale Amortized Cost	$ 416
Mortgage-Backed Securities Available for Sale Fair Value	431
Real Estate Mortgage Investment Conduits
Mortgage-Backed Securities Available for Sale Amortized Cost	230	319
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains	7	10
Mortgage-Backed Securities Available for Sale Fair Value	237	329
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)
Mortgage-Backed Securities Available for Sale Amortized Cost	183	613
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains	8	23
Mortgage-Backed Securities Available for Sale Fair Value	191	636
Federal National Mortgage Association Certificates and Obligations (FNMA)
Mortgage-Backed Securities Available for Sale Amortized Cost	3	8
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains		1
Mortgage-Backed Securities Available for Sale Fair Value	3	9
Mortgage-Backed Securities Available for Sale
Mortgage-Backed Securities Available for Sale Amortized Cost	416	940
Mortgage-Backed Securities Available for Sale Gross Unrealized Gains	15	34
Mortgage-Backed Securities Available for Sale Fair Value	$ 431	$ 974