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Note 10 - Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2012
Note 10 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)     146,400    
Employee Stock Option [Member] | Stock Incentive Plan 2006 and Stock Option Plan 1998 [Member]
         
Note 10 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 710,800   710,800    
Employee Stock Option [Member]
         
Note 10 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number (in Shares) 710,800   710,800   622,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)     146,400    
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Contractual Term     7 years    
Share-based Compensation Arrangement by Share-based Payment Award Fair Value Assumptions Number of Quarters Used In Calculation of Expected Dividend Rate     4    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 108,326 $ 136,582 $ 335,940 $ 173,288  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 623,383   623,383    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     1 year 109 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 76,851 $ 71,757 $ 153,676 $ 143,513  
Stock Incentive Plan 2006 [Member]
         
Note 10 - Stock-Based Compensation (Details) [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 138,489   138,489