Note 10 - Investment Securities (Detail) - Securities With Gross Unrealized Losses (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Unrealized Loss Position Less Than 12 Months - Fair Value	$ 11,255
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(76)
Unrealized Loss Position - Fair Value	11,255
Unrealized Loss Position - Gross Unrealized Losses	(76)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Federal National Mortgage Association [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	346
Unrealized Loss Position - Fair Value	346
Federal Home Loan Bank Bonds [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	2,000
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(8)
Unrealized Loss Positon 12 Months or Greater - Fair Value	0
Unrealized Loss Positon 12 Months or Greater - Gross Unrealized Losses	0
Unrealized Loss Position - Fair Value	2,000
Unrealized Loss Position - Gross Unrealized Losses	(8)
Federal Farm Credit Bonds [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	2,500
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(25)
Unrealized Loss Position - Fair Value	2,500
Unrealized Loss Position - Gross Unrealized Losses	(25)
Federal Home Loan Mortgage Corporation Bonds [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	1,499
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(6)
Unrealized Loss Position - Fair Value	1,499
Unrealized Loss Position - Gross Unrealized Losses	(6)
Federal National Mortgage Association [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	4,497
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(34)
Unrealized Loss Position - Fair Value	4,497
Unrealized Loss Position - Gross Unrealized Losses	(34)
Total Bonds [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	10,496
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(73)
Unrealized Loss Positon 12 Months or Greater - Fair Value	0
Unrealized Loss Positon 12 Months or Greater - Gross Unrealized Losses	0
Unrealized Loss Position - Fair Value	10,496
Unrealized Loss Position - Gross Unrealized Losses	(73)
Federal Home Loan Mortgage Corporation [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	374
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(2)
Unrealized Loss Positon 12 Months or Greater - Fair Value	0
Unrealized Loss Positon 12 Months or Greater - Gross Unrealized Losses	0
Unrealized Loss Position - Fair Value	374
Unrealized Loss Position - Gross Unrealized Losses	(2)
Government National Mortgage Corporation [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	39
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(1)
Unrealized Loss Positon 12 Months or Greater - Fair Value	0
Unrealized Loss Positon 12 Months or Greater - Gross Unrealized Losses	0
Unrealized Loss Position - Fair Value	39
Unrealized Loss Position - Gross Unrealized Losses	(1)
Total Mortgage-Backed Securities [Member]
Unrealized Loss Position Less Than 12 Months - Fair Value	759
Unrealized Loss Position Less Than 12 Months - Gross Unrealized Losses	(3)
Unrealized Loss Positon 12 Months or Greater - Fair Value	0
Unrealized Loss Positon 12 Months or Greater - Gross Unrealized Losses	0
Unrealized Loss Position - Fair Value	759
Unrealized Loss Position - Gross Unrealized Losses	$ (3)