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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended
Apr. 23, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)   2,174,491 2,408,151 2,066,343 2,440,878
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   0      
Share-Based Payment Arrangement, Option [Member]          
Share-Based Payment Arrangement, Amount Capitalized   $ 305,370 $ 113,507    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 3,140,335 $ 914,389    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   3 years 3 months 2 years 8 months 12 days    
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Employee [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares)   216,296      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate   2.45%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate   89.76%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Dividend Rate   0.00%      
Share Price (in dollars per share)   $ 1.52      
Share-Based Payment Arrangement, Option [Member] | Share-Based Payment Arrangement, Nonemployee [Member]          
Share-Based Payment Arrangement, Expense   $ 4,978 $ 10,329    
Restricted Stock [Member]          
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 169,792      
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)   1 year 5 months 15 days      
Share-Based Payment Arrangement, Expense   $ 22,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   130,816   96,557  
The 2020 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares)   4,000,000      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)   3 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period (Year)   5 years      
Chief Executive Officer, Chief Financial Officer and Employees [Member]          
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)   2,000,127 2,264,127    
Non-Employees [Member]          
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   174,364 144,024    
Vice Chairman of the Board of Directors [Member] | The 2020 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Option [Member]          
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year) 5 years        
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 2,000,000