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Note 5 - Stock-based Compensation (Details) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Apr. 22, 2014
Note 5 - Stock-based Compensation (Details) [Line Items]      
Allocated Share-based Compensation Expense $ 1,053,000 $ 893,000  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 434,000 363,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 401,000 516,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,549,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 328 days    
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options $ 524,000 766,000  
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options $ 157,000 189,000  
2006 Compensation Plan [Member]      
Note 5 - Stock-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares)     0
Minimum Exercise Price of Stock Options and Stock Appreciation Rights, Percentage 100.00%    
2014 Equity Incentive Plan [Member]      
Note 5 - Stock-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 1,419,666    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 1,500,000    
Restricted Stock Units (RSUs) [Member]      
Note 5 - Stock-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Aggregate Intrinsic Value, Converted $ 965,000 348,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 1,524,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years    
Restricted Stock Units (RSUs) [Member] | 2014 Equity Incentive Plan [Member]      
Note 5 - Stock-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 437,701    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 525,000    
Employee Stock Option [Member]      
Note 5 - Stock-based Compensation (Details) [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 25,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 328 days    
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards $ 0 $ 0  
Employee Stock Option [Member] | 2006 Compensation Plan [Member]      
Note 5 - Stock-based Compensation (Details) [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years