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Note 6 - Equity Incentive Plan (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
shares
Jun. 30, 2014
shares
Sep. 30, 2015
USD ($)
$ / shares
shares
Sep. 30, 2014
USD ($)
shares
Plan [Member] | Restricted Stock Units (RSUs) [Member] | Board of Directors [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       9,678  
Plan [Member] | Restricted Stock Units (RSUs) [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0        
Plan [Member] | Employee Stock Option [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years  
Plan [Member] | Restricted Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       23,375  
Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0     111,625  
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       1 year  
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights Outstanding, Cash Settlement Features, Number 0 0   0 0
Allocated Share-based Compensation Expense | $ $ 498,442 $ 390,578   $ 1,562,391 $ 1,196,361
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized | $ 4,500,000     $ 4,500,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years 266 days  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Exercises in Period, Total Intrinsic Value | $       $ 3,165,838 25,473,089
Proceeds from Stock Options Exercised | $ $ 105,785 $ 17,513   $ 1,074,814 $ 1,379,294
Stock Repurchased and Retired During Period, Shares     133,774    
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding Number 812,457     812,457  
Share-based Compensation Arrangement by Share-based Payment Award Options and Stock Appreciation Rights Weighted Average Exercise Price | $ / shares $ 17.92     $ 17.92  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Intrinsic Value | $ $ 12,900,000     $ 12,900,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options and Stock Appreciation Rights, Outstanding, Weighted Average Remaining ContractualTerm       6 years 255 days  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years