Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	$ 23,574	$ 7,359
Less Than 12 Months, Gross Unrealized Losses	(1,414)	(62)
12 Months or Greater, Fair Value	0	31
12 Months or Greater, Gross Unrealized Losses	0	(1)
Total, Fair Value	23,574	7,390
Total, Gross Unrealized Losses	(1,414)	(63)
Federal Home Loan Bank Bonds [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	7,119	2,454
Less Than 12 Months, Gross Unrealized Losses	(472)	(22)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Gross Unrealized Losses	0	0
Total, Fair Value	7,119	2,454
Total, Gross Unrealized Losses	(472)	(22)
Federal Farm Credit Bonds [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	5,104	2,428
Less Than 12 Months, Gross Unrealized Losses	(340)	(17)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Gross Unrealized Losses	0	0
Total, Fair Value	5,104	2,428
Total, Gross Unrealized Losses	(340)	(17)
Federal Home Loan Mortgage Corporation Bonds [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	1,863
Less Than 12 Months, Gross Unrealized Losses	(134)
12 Months or Greater, Fair Value	0
12 Months or Greater, Gross Unrealized Losses	0
Total, Fair Value	1,863
Total, Gross Unrealized Losses	(134)
Federal National Mortgage Association [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	9,035	1,979
Less Than 12 Months, Gross Unrealized Losses	(463)	(21)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Gross Unrealized Losses	0	0
Total, Fair Value	9,035	1,979
Total, Gross Unrealized Losses	(463)	(21)
Total Bonds [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	23,121	7,359
Less Than 12 Months, Gross Unrealized Losses	(1,409)	(62)
12 Months or Greater, Fair Value	0
12 Months or Greater, Gross Unrealized Losses	0
Total, Fair Value	23,121	7,359
Total, Gross Unrealized Losses	(1,409)	(62)
Federal Home Loan Mortgage Corporation [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	211	498
Less Than 12 Months, Gross Unrealized Losses	(1)	(2)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Gross Unrealized Losses	0	0
Total, Fair Value	211	498
Total, Gross Unrealized Losses	(1)	(2)
Federal National Mortgage Association Mortgage Backed Securities [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	0
Less Than 12 Months, Gross Unrealized Losses	0
12 Months or Greater, Fair Value	0
12 Months or Greater, Gross Unrealized Losses	0
Total, Fair Value	0
Total, Gross Unrealized Losses	0
Government National Mortgage Association [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	32
Less Than 12 Months, Gross Unrealized Losses	(1)
12 Months or Greater, Fair Value	0	31
12 Months or Greater, Gross Unrealized Losses	0	(1)
Total, Fair Value	32	31
Total, Gross Unrealized Losses	(1)	(1)
Total Mortgage-Backed Securities [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	243
Less Than 12 Months, Gross Unrealized Losses	(2)
12 Months or Greater, Fair Value	0
12 Months or Greater, Gross Unrealized Losses	0
Total, Fair Value	243
Total, Gross Unrealized Losses	(2)
Mutual Fund Shares [Member]
Note 10 - Investment Securities (Details) - Securities With Gross Unrealized Losses [Line Items]
Less Than 12 Months, Fair Value	210
Less Than 12 Months, Gross Unrealized Losses	(3)
12 Months or Greater, Fair Value	0
12 Months or Greater, Gross Unrealized Losses	0
Total, Fair Value	210
Total, Gross Unrealized Losses	$ (3)