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Note 13 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Employee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%      
Stock Appreciation Rights (SARs) [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years      
Restricted Stock [Member] | Officer [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     5 years      
Restricted Stock [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year      
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     51,122   52,898  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 150,094   150,094   155,858 171,139
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years      
Sharebased Compensation Arrangement by Share-based Payment Award Post Vesting Holding Period     1 year      
Share-based Compensation Arrangement by Share-based Payment Award Liquidity Discount 4.50%   4.50%   4.80%  
Restricted Stock Units (RSUs) [Member] | Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   8,144        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted $ 175 $ 200        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled in Period 1,018          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 7,126   7,126      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans 1   1      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 167,848   167,848      
Share-based Compensation Arrangement by Share-based Payment Award, Expected Additional Compensation Cost Remainder of Year $ 1,100   $ 1,100      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 4,800   $ 4,800      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     5 years      
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options     $ 1,000 $ 1,600