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Note 8 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 09, 2021
Apr. 08, 2021
Feb. 26, 2021
Jan. 06, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2013
May 21, 2020
Common Stock, Shares Authorized (in shares)         100,000,000       100,000,000   100,000,000    
Common Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001       $ 0.001   $ 0.001    
Common Stock, Shares, Issued, Total (in shares)         21,777,373   21,649,213   21,777,373 21,649,213 21,655,461    
Preferred Stock, Shares Authorized (in shares)         2,500,000       2,500,000   2,500,000    
Preferred Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001       $ 0.001   $ 0.001    
Preferred Stock, Shares Issued, Total (in shares)         0       0   0    
Stock Issued During Period, Value, Issued for Services           $ 0 $ 0 $ 45,000          
Stock Issued During Period, Shares, Issued for Commitment Fee (in shares) 80,000 80,000                      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)                         515,000
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)                         $ 5.00
Share-based Payment Arrangement, Expense         $ 125,076   $ 82,335   $ 227,464 $ 223,557      
Common Stock, Shares, Outstanding, Ending Balance (in shares)         21,777,373   21,649,213   21,777,373 21,649,213 21,655,461    
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         0       0   0    
The 2011 Stock Options Plan [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         0       0        
Restricted Stock Units (RSUs) [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)         145,460       145,460   128,299    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                 59,073        
Share-based Payment Arrangement, Expense         $ 125,076   $ 82,335   $ 227,464 $ 223,557      
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 771,035       $ 771,035        
Director [Member]                          
Stock Issued During Period, Shares, Issued for Services (in shares)       11,218                  
Stock Issued During Period, Value, Issued for Services       $ 70,000                  
Director [Member] | Restricted Stock Units (RSUs) [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                       25,000  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                       3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant                       $ 35,000  
Management [Member]                          
Stock Issued During Period, Shares, Issued for Services (in shares)     30,694                    
Stock Issued During Period, Value, Issued for Services     $ 166,667                    
Management [Member] | Restricted Stock Units (RSUs) [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)                     40,432    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)                     3 years    
Board of Directors Chairman [Member] | Restricted Stock Units (RSUs) [Member]                          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Annual Grant                       $ 70,000  
Convertible Preferred Stock [Member]                          
Preferred Stock, Shares Issued, Total (in shares)         0       0        
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         0       0