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Note 10 - Stock-based Compensation Plans (Details) - $ / shares
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 39,027      
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price (in Dollars per share) $ 20.45      
Independent Directors Stock Incentive Plan [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Estimated Options Forfeiture Rate       3.00%
Stock Incentive Plan [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Estimated Options Forfeiture Rate       34.00%
Restricted Stock [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   34,800 16,711  
Restricted Stock [Member] | Chief Executive Officer [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   5,174    
Restricted Stock [Member] | Independent Directors Stock Incentive Plan [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   7,130    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year    
Restricted Stock [Member] | Share-based Compensation Award, Tranche One [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   20,298    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Two [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   2,198    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years    
Restricted Stock [Member] | Share-based Compensation Award, Tranche Three [Member]        
Note 10 - Stock-based Compensation Plans (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years