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Note 7 - Stockholders' Equity (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended 36 Months Ended
Jun. 06, 2020
May 21, 2020
Jan. 15, 2020
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2013
Jun. 30, 2020
Dec. 31, 2019
Common Stock, Shares Authorized (in shares)       25,000,000       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 $ 0.001
Common Stock, Shares, Issued, Total (in shares)       21,649,213   20,547,668   21,649,213 20,547,668   21,649,213 20,547,668
Common Stock, Shares, Outstanding, Ending Balance (in shares)       21,649,213   20,547,668   21,649,213 20,547,668   21,649,213 20,547,668
Preferred Stock, Shares Authorized (in shares)       2,500,000       2,500,000     2,500,000 2,500,000
Preferred Stock, Shares Issued, Total (in shares)       0       0     0 0
Stock Issued During Period, Value, Issued for Services         $ 45,000   $ 112,500          
Stock Issued During Period, Shares, New Issues (in shares)   1,085,000                    
Shares Issued, Price Per Share (in dollars per share)   $ 5.00                    
Proceeds from Issuance of Common Stock   $ 4,744,048           $ 4,744,048 $ 14,674,738      
Payments of Stock Issuance Costs   $ 680,952                    
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   $ 5.00       $ 5.00     $ 5.00  
Proceeds from Issuance of Warrants   $ 2,575,000           $ 2,575,000 0      
Share-based Payment Arrangement, Expense       $ 82,335   $ 23,167   $ 223,557 151,611      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)       25,000       25,000     25,000 25,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount       $ 0       $ 0     $ 0  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0       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)       25,000       25,000     25,000  
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               $ 223,557 151,611      
Restricted Stock Units (RSUs) [Member]                        
Share-based Payment Arrangement, Expense       $ 82,335   $ 23,167   $ 223,557 $ 151,611      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)       136,632       136,632     136,632 133,747
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)               19,430   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               $ 30,000        
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount       $ 559,167       559,167     $ 559,167  
Share-based Payment Arrangement, Option [Member] | The 2011 Stock Options Plan [Member]                        
Share-based Payment Arrangement, Expense               $ 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                  
Convertible Preferred Stock [Member]                        
Preferred Stock, Shares Issued, Total (in shares)       0   0   0 0   0  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)       0   0   0 0   0