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Note 14 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans 1      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 273,302      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years      
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 231 $ 180    
Share-based Compensation Arrangement by Share-based Payment Award, Expected Additional Compensation Cost Remainder of Year 2,100      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 6,400      
Proceeds (Used for) and Received from Settlement of Stock Awards (216) $ 495    
Accounting Standards Update 2016-09 [Member]        
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 1,000      
Employee Stock Option [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      
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
Restricted Stock [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 28,625   51,122  
Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     1 year  
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 5.12%   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 4,680      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted $ 220