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Note 4 - Share-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Jun. 09, 2016
Feb. 22, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Director [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 17,184          
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price $ 22.02          
Directors and Employees [Member] | Employee and Nonemployee Stock Option [Member]            
Allocated Share-based Compensation Expense     $ 34,000 $ 44,000 $ 212,000 $ 237,000
Chief Executive Officer [Member] | The 2003 Incentive Plan [Member] | Common Stock [Member]            
Stock Granted, Value, Share-based Compensation, Gross   $ 400,000        
Chief Executive Officer [Member] | The 2003 Incentive Plan [Member]            
Allocated Share-based Compensation Expense     100,000 100,000 $ 300,000 300,000
Employee and Nonemployee Stock Option [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         17,184  
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price         $ 22.02  
Restricted Stock Units (RSUs) [Member]            
Allocated Share-based Compensation Expense     95,000 82,000 $ 254,000 $ 231,000
Shares Paid for Tax Withholding for Share Based Compensation         3,889 3,405
Shares Paid for Tax Withholding for Share Based Compensation Market Price         $ 22.82 $ 23.15
Stock Issued During Period, Value, Share-based Compensation, Gross         $ 105,000 $ 105,000
Shares Paid for Exercise Price and Tax Withholding for Share Based Compensation         0 1,632
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     67,000 $ 63,000 $ 264,000 $ 256,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value         564,000 989,000
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options         529,000 $ 258,000
Shares Paid For Tax Withholding For Share Based Compensation, Average Market Price           $ 21.97
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized     $ 947,000   $ 947,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition         3 years 182 days