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Note 12 - Stock Options, Incentive Plans, Stock Awards, and Employee Benefit Plan (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
     
 
      
 
    
Weighted Average
      
 
  
     
 
    
Weighted Average
    
Contractual
    
Aggregate Intrinsic
  
Stock Awards
  
Shares
    
Exercise Price
    
Remaining Life
    
Value
  
Outstanding, December 31, 2019
    
4,023,780
     $
2.25
      
 
      
 
  
Granted
    
1,634,000
      
1.20
      
 
      
 
  
Vested
    
(106,667
 )    
—
      
 
      
 
  
Forfeited
    
(450,000
 )    
—
      
 
      
 
  
                                 
Outstanding, December 31, 2020
    
5,101,113
     $
1.96
      
6.94
     $
0.71
  
                                 
Expected to Vest after December 31, 2020
    
5,101,113
     $
1.96
      
6.94
     $
0.71