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Note 13 - Stock-based Compensation (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mar. 31, 2016
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 174,458      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance 0      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Expected Additional Compensation Cost Remainder of Year $ 2,500      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 7,400      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 5 years      
Proceeds (Used for) and Received from Settlement of Stock Awards $ (156) $ (216)    
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]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 38,205   28,625  
Restricted Stock [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 6,525      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Fair Value Granted $ 247      
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 4.26% 5.12%   4.50%