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Note 10 - Equity Incentive Plans (Details Textual) - shares
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 06, 2020
Jul. 31, 2020
Apr. 30, 2020
Mar. 31, 2020
Feb. 29, 2020
Jun. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Jun. 03, 2020
Jun. 10, 2019
Percentage of Salaries Reductions in Reponse to COVID-19     20.00%              
Subsequent Event [Member]                    
Percentage of Salaries Reductions in Reponse to COVID-19   20.00%                
Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             349,750      
Stock Incentive Plan 2010 [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                 6,980,074 3,266,661
Common Stock, Capital Shares Reserved for Future Issuance (in shares)                 3,713,413  
Stock Incentive Plan 2010 [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     239,155              
Stock Incentive Plan 2010 [Member] | Restricted Stock [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)   115,156                
Stock Incentive Plan 2010 [Member] | Share-based Payment Arrangement, Tranche One [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 3,989,140       109,337          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         3 years          
Stock Incentive Plan 2010 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Restricted Stock [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)     29,032   1,258          
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)         2 years          
Stock Incentive Plan 2010 [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Restricted Stock [Member] | Subsequent Event [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) 101,730                  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 2 years                  
Employee Stock Purchase Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           5,202,941 5,202,941 190    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)               190    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)       4,055   286,324        
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent               85.00%    
Stock Issued During Period, Shares, Employee Stock Purchase Plans (in shares)             0 0