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Note 16 - Stock-based Compensation Plan (Details Textual) - USD ($)
12 Months Ended
Feb. 20, 2018
Feb. 17, 2015
May 20, 2009
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 0    
Allocated Share-based Compensation Expense       $ 89,000 $ 82,000 $ 71,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value       $ 109,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       3,500 0 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       $ 212,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years 182 days    
Restricted Stock [Member] | Officers, Directors and Key Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   19,500        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 24.50        
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 478,000        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   5 years        
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Subsequent Event [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 20,000          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 37.42          
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 748,000          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years          
Equity Incentive Plan 2009 [Member]            
Maximum Fair Value of First Exercisable Stock Incentive Options     $ 100,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross       0    
Equity Incentive Plan 2009 [Member] | Common Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     223,000      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       204,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years