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Note 12 - Stock-based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
May. 31, 2015
May. 31, 2010
May. 31, 2005
Note 12 - Stock-based Compensation (Details) [Line Items]              
Allocated Share-based Compensation Expense (in Dollars) $ 654,000 $ 688,000 $ 1,132,000 $ 1,170,000      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) $ 1,125,000   $ 1,125,000        
2005 Plan [Member]              
Note 12 - Stock-based Compensation (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             1,200,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 175,620   175,620        
2005 Plan [Member] | Director [Member]              
Note 12 - Stock-based Compensation (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     45,000        
2010 Plan [Member]              
Note 12 - Stock-based Compensation (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         2,575,000 1,200,000  
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     11,804        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,761,940   1,761,940        
Employee Stock Option [Member]              
Note 12 - Stock-based Compensation (Details) [Line Items]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     255 days        
Maximum [Member] | Incentive Stock Option [Member]              
Note 12 - Stock-based Compensation (Details) [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years