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Note 10 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 12 Months Ended 42 Months Ended
Jun. 06, 2020
May 21, 2020
Jan. 15, 2020
Aug. 18, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2013
Dec. 31, 2020
Dec. 31, 2018
Common Stock, Shares Authorized (in shares)         25,000,000 25,000,000   25,000,000  
Common Stock, Par or Stated Value Per Share (in dollars per share)   $ 0.001     $ 0.001 $ 0.001   $ 0.001  
Common Stock, Shares, Outstanding, Ending Balance (in shares)         21,655,461 20,547,668   21,655,461  
Preferred Stock, Shares Authorized (in shares)         2,500,000 2,500,000   2,500,000  
Preferred Stock, Shares Issued, Total (in shares)         0 0   0  
Stock Issued During Period, Shares, New Issues (in shares)   1,085,000              
Shares Issued, Price Per Share (in dollars per share)   $ 5.00             $ 7.25
Proceeds from Issuance of Common Stock   $ 4,662,125     $ 4,662,127 $ 14,516,839      
Payments of Stock Issuance Costs   $ 762,875              
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              
Proceeds from Issuance of Warrants   $ 2,575,000     2,575,000 0      
Proceeds from Stock Options Exercised         18,500 133,200      
The Warrant [Member]                  
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              
Stock Awards Other than Options [Member]                  
Share-based Payment Arrangement, Expense         343,780 197,945      
Restricted Stock Units (RSUs) [Member]                  
Share-based Payment Arrangement, Expense         $ 343,780 $ 197,945      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)         128,299 133,747   128,299  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)         44,430   25,000 92,081  
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    
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount         $ 472,778     $ 472,778  
The 2015 Stock Option Plan [Member]                  
Shares Issued, Price Per Share (in dollars per share)       $ 2.96          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares)       6,248          
Proceeds from Stock Options Exercised       $ 18,500          
The 2011 Stock Options Plan [Member]                  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)         0     0  
Director [Member]                  
Stock Issued During Period, Shares, Issued for Services (in shares) 8,333   8,212            
Stock Issued During Period, Value, Issued for Services $ 69,333   $ 45,000            
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   0