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Note 14 - Stock-based Compensation (Tables)
 12 Months Ended
Dec. 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
    
(469,701
 )   $
2.59
      
 
      
 
  
Cancelled/Forfeited
    
(14,000
 )   $
3.13
      
 
      
 
  
Outstanding at December 31, 2019
    
2,687,499
     $
3.66
      
2.2
     $
14,386,956
  
Exercisable at December 31, 2019
    
1,076,836
     $
3.50
      
1.5
     $
5,930,463