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Note 7 - Stock-based Awards (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 04, 2017
May 12, 2016
Sep. 15, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       199,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 121,000     121,000    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years    
Share Price $ 4.46 $ 2.34 $ 1.91      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 18.87 $ 13.82 $ 10.21      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 91 days 6 years 91 days 6 years 182 days      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate 37.00% 33.00% 36.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.75% 1.75% 2.20%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate 4.70% 5.60% 6.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       2,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       56,000 9,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value       $ 677 $ 691 $ 641
Conversion of Stock, Amount Issued       $ 776 $ 727 $ 824
Non-Employee Board Members [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 2 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 2 years          
Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years          
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 4 years          
Stock Unit Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 12,500          
Employee Stock Option [Member]            
Share Price       $ 20.56 $ 24.68  
Incentive Plan 2006 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period       2,500 0 0
Common Stock, Capital Shares Reserved for Future Issuance       508,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options       $ 938    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term       2 years 292 days    
Expired Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period         134,000 41,000
Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       500,000    
Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant       850,000