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Note 6 - Earnings (Loss) Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
   
Three Months Ended
September
30,
    
Nine
Months Ended
September
30,
  
   
2017
    
2016
    
2017
    
2016
  
Weighted average shares outstanding, basic
    
162,006,646
      
155,481,278
      
161,437,276
      
155,390,911
  
Dilutive shares related to warrants
    
—
      
—
      
4,277,197
      
—
  
Unvested restricted stock
    
—
      
—
      
200,000
      
—
  
Weighted average shares outstanding, diluted
    
162,006,646
      
155,481,278
      
165,914,473
      
155,390,911