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Note 12 - Stock-based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Option, Activity [Table Text Block]
   
Number of Shares
    
Weighted-Average Exercise Price
    
Weighted-Average of Remaining Contractual Life (in years)
    
Aggregate Intrinsic Value
  
Outstanding at December 31, 2018
    
3,121,200
     $
3.50
      
 
      
 
  
Issued
    
50,000
     $
3.13
      
 
      
 
  
Exercised
    
(419,500
 )   $
2.54
      
 
      
 
  
Cancelled/Forfeited
    
—
     $
—
      
 
      
 
  
Outstanding at March 31, 2019
    
2,751,700
     $
3.64
      
2.9
     $
934,117
  
Exercisable at March 31, 2019
    
959,868
     $
3.34
      
2.1
     $
239,953