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Note 11 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
May. 31, 2010
May. 30, 2010
May. 31, 2005
Maximum [Member] | Incentive Stock Option [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years        
Employee Stock Option [Member]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     146 days        
2005 Plan [Member] | Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     45,000        
2005 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         2,575,000 1,200,000 1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 175,620   175,620        
2010 Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     11,592        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,762,152   1,762,152        
Allocated Share-based Compensation Expense $ 425,000 $ 377,000 $ 1,557,000 $ 1,547,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 699,000   $ 699,000