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Note 10 - Equity Incentive Plans (Details Textual) - shares
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jul. 06, 2020
Jul. 31, 2020
Apr. 30, 2020
Mar. 31, 2020
Feb. 29, 2020
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 03, 2020
Jun. 10, 2019
Percentage of Salaries Reductions in Reponse to COVID-19   20.00% 20.00%                  
Restricted Stock [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               4,454,046        
Stock Incentive Plan 2010 [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)           1,242,905   1,242,905     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)   115,156 239,155                  
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)           245,990 77,768          
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) 101,730   29,032   1,258              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) 2 years       2 years              
Employee Stock Purchase Plan [Member]                        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)                   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                
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