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Note 7 - Stockholders' Equity (Details Textual)
 1 Months Ended 6 Months Ended 12 Months Ended
Jun. 06, 2019
shares
May 22, 2019
USD ($)
$ / shares
shares
Mar. 05, 2019
USD ($)
shares
Mar. 01, 2019
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
shares
Dec. 31, 2018
$ / shares
shares
Common Stock, Shares Authorized         25,000,000   25,000,000
Common Stock, Par or Stated Value Per Share | $ / shares         $ 0.001   $ 0.001
Common Stock, Shares, Issued, Total         20,547,668   18,228,887
Stockholders' Equity Note, Stock Split, Conversion Ratio         4   4
Preferred Stock, Shares Authorized         2,500,000   2,500,000
Preferred Stock, Shares Outstanding, Ending Balance         0   0
Proceeds from Stock Options Exercised | $         $ 133,200  
Proceeds from Issuance of Common Stock | $         14,674,738 5,865,077  
Class of Warrant or Right, Exercised During Period 28,887            
Share-based Payment Arrangement, Expense | $         $ 39,111 $ 27,434  
Class of Warrant or Right, Outstanding, Non-vested Warrants         0 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         25,000   70,000
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount | $         $ 0    
Common Stock, Shares, Outstanding, Ending Balance         20,547,668   18,228,887
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross            
The 2011 Stock Options Plan [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance         25,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         25,000    
Public Offering [Member]              
Stock Issued During Period, Shares, New Issues   2,215,862          
Share Price | $ / shares   $ 7.25          
Proceeds from Issuance of Common Stock | $   $ 14,674,738          
Payments of Stock Issuance Costs | $   $ 1,390,262          
The 2015 Stock Option Plan [Member]              
Stock Issued During Period, Shares, New Issues       45,000      
Share Price | $ / shares       $ 2.96      
Proceeds from Stock Options Exercised | $       $ 133,200      
Warrants [Member]              
Share-based Payment Arrangement, Expense | $         $ 0 $ 0  
Share-based Payment Arrangement, Option [Member] | The 2011 Stock Options Plan [Member]              
Share-based Payment Arrangement, Expense | $         $ 0 $ 27,434  
Director [Member]              
Stock Issued During Period, Shares, Restricted Stock Award, Gross     24,827        
Stock Issued During Period, Value, Restricted Stock Award, Gross | $     $ 112,500        
Convertible Preferred Stock [Member]              
Preferred Stock, Shares Outstanding, Ending Balance         0   0
Reverse Stock Split [Member]              
Stockholders' Equity Note, Stock Split, Conversion Ratio             4