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Note 13 - Stockholders' Equity (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
$ / shares
shares
Note 13 - Stockholders' Equity (Details) [Line Items]    
Treasury Stock, Shares, Acquired | shares 735,599 914,671
Treasury Stock Acquired, Average Cost Per Share | $ / shares $ 19.51 $ 19.29
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 899,600  
Shareholder Rights Plan [Member]    
Note 13 - Stockholders' Equity (Details) [Line Items]    
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%  
Percentage of Common Stock Prior to Acquisition 50.00%  
Percentage of Assets or Earning Power Sold   50.00%
Shareholder Rights Plan [Member] | Common Stock [Member]    
Note 13 - Stockholders' Equity (Details) [Line Items]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 1  
Shareholder Rights Plan [Member] | Common Stock Equivalent [Member]    
Note 13 - Stockholders' Equity (Details) [Line Items]    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares 1  
Savings Bank [Member]    
Note 13 - Stockholders' Equity (Details) [Line Items]    
Liquidation Account, Conversion From Mutual to Stock Form $ 800,000  
Available to Distribute to the Holding Company as Cash Dividends [Member]    
Note 13 - Stockholders' Equity (Details) [Line Items]    
Retained Earnings, Unappropriated $ 67,400,000