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Note 4 - Stockholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Nov. 09, 2021
Mar. 16, 2021
Mar. 05, 2021
Sep. 13, 2018
Aug. 09, 2017
Mar. 31, 2022
Mar. 31, 2021
Nov. 30, 2020
Jun. 30, 2017
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)           $ 4.47      
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           760,000      
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount           $ 9.0      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)           2 years 2 months 12 days      
Share-Based Payment Arrangement, Expense           $ 1.1 $ 0.6    
The 2018 Incentive Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 4,000,000     1,750,000          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)       7,000,000          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares)       3,669,650          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)           760,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Granted in Period, Fair Value           $ 2.7      
The 2018 Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate           0.00%      
The 2018 Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Employees [Member]                  
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Term (Year)           6 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate           82.00%      
The 2018 Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Minimum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount Rate           1.60%      
The 2018 Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member] | Maximum [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Discount Rate           1.90%      
June 2017 Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         58,502       2,646,091
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)         $ 6.41 $ 7.50     $ 7.50
Warrants and Rights Outstanding, Term (Year)                 10 years
Class of Warrant or Right, Term (Year)         10 years        
Public Offering [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)     7,875,000            
Shares Issued, Price Per Share (in dollars per share)     $ 8.00            
Proceeds from Issuance of Common Stock     $ 63.0            
Proceeds from Issuance of Common Stock, Net of Discounts and Issuance Costs     $ 59.0            
Over-Allotment Option [Member]                  
Stock Issued During Period, Shares, New Issues (in shares)   1,049,700              
Proceeds from Issuance of Common Stock   $ 8.4              
Proceeds from Issuance of Common Stock, Net of Discounts and Issuance Costs   $ 7.9              
Sale of Stock, Option to Purchase Shares (in shares)     1,181,250            
November 2020 Warrants [Member]                  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               5,230,910  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)               $ 4.31  
Warrants and Rights Outstanding, Term (Year)               5 years