Note 13 - Stockholders' Equity (Detail) (USD $)	1 Months Ended	12 Months Ended
	Nov. 30, 2010	Dec. 31, 2012	Dec. 31, 2011
Treasury Stock, Shares, Acquired (in Shares)		352,000	624,088
Treasury Stock Acquired, Average Cost Per Share (in Dollars per share)		$ 14.26	$ 11.72
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 385,962
Shelf Registration, Maximum Amount Allowed to Offer and Sell	170,000,000
Shareholder Rights Plan [Member]
Number of Rights To Purchase Series A Junior Participating Preferred Stock Per Common Stock Owned		1
Purchase Price of Series A Junior Participating Preferred Stock, Per Right To Purchase		65
Percentage Ownership of Holding Company's Common Stock At Which Rights Become Exercisable		15.00%
Available to Distribute to the Holding Company as Cash Dividends [Member]
Retained Earnings, Unappropriated		59,300,000
Savings Bank [Member]
Liquidation Account, Conversion From Mutual to Stock Form		$ 1,300,000