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Note 2 - Earnings Per Share (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   
Three and Nine Months ended September 30,
 
   
2020
   
2019
 
                 
Warrants to purchase common stock - liability classified
   
52,032
     
54,989
 
Warrant to purchase common stock - equity classified
   
2,682,166
     
 
Conversion of 2020/21 Notes    
5,789,209
     
 
Conversion of 2020 Notes
   
     
997,914
 
Outstanding options to purchase common stock
   
1,552
     
1,564
 
Stock appreciation rights    
132,566
     
132,566
 
                 
Total
   
8,657,525
     
1,187,033