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Note 13 - Stock-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2019
    
2,687,499
     $
3.66
      
 
      
 
  
Issued
    
—
     $
—
      
 
      
 
  
Exercised
    
(148,500
 )   $
3.68
      
 
      
 
  
Cancelled/Forfeited
    
—
     $
—
      
 
      
 
  
Outstanding at September 30, 2020
    
2,538,999
     $
3.66
      
1.6
     $
20,933,160
  
Exercisable at September 30, 2020
    
2,011,167
     $
3.13
      
1.2
     $
17,628,216