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Note 15 - Stock-based Compensation Plan (Details Textual) - USD ($)
12 Months Ended
Feb. 19, 2019
Feb. 20, 2018
Feb. 17, 2015
May 20, 2009
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restricted Stock [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    
Allocated Share-based Compensation Expense, Total         $ 192,000 $ 89,000 $ 82,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value         171,000 $ 109,000 $ 0
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total         $ 720,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         3 years 255 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   20,000 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   $ 37.42 $ 24.50        
Stock Issued During Period, Value, Restricted Stock Award, Gross   $ 748,000 $ 478,000        
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 9,750            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 52.09            
Stock Issued During Period, Value, Restricted Stock Award, Gross $ 508,000            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years            
Restricted Stock [Member] | Officers, Directors and Key Employees [Member] | Vesting Each Year on July 1, Beginning in 2019 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   20.00%          
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         185,900    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years