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Note 4 - Accounting for Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2019
Notes Tables  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   
For Three
Months Ended
September 30, 2019
    
For Three
Months Ended
September 30, 2018
    
For Nine
Months Ended
September 30, 2019
    
For Nine
Months Ended
September 30, 2018
  
                                 
Weighted average grant date fair value
    
—
      
—
     $
3.61
     $
0.99
  
Weighted average assumptions used:
                                
Expected dividend yield
    
—
      
—
      
0.0
%
    
0.0
%
Risk-free interest rate
    
—
      
—
      
2.19
%
    
2.93
%
Expected volatility
    
—
      
—
      
127.52
%
    
131.0
%
Expected life (in years)
    
—
      
—
      
5.0
      
5.0