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Note 9 - Share-based Compensation and Employee Benefit Plan (Tables)
 9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended September 30, 2020:
  
Number of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at June 30, 2020
    
26,597
     $
8.89
  
Vested
    
(1,200
 )   $
17.41
  
Unvested at September 30, 2020
    
25,397
     $
8.49
  
                 
Nine months ended September 30, 2020:
  
 
 
 
  
 
 
 
Unvested at December 31, 2019
    
21,470
     $
12.91
  
Granted
    
12,484
     $
6.12
  
Vested
    
(6,372
 )   $
16.20
  
Forfeited
    
(2,185
 )   $
15.92
  
Unvested at September 30, 2020
    
25,397
     $
8.49
  
Three months ended September 30, 2019:
  
Number of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at June 30, 2019
    
29,529
     $
13.94
  
Vested
    
(2,392
 )   $
17.11
  
Unvested at September 30, 2019
    
27,137
     $
13.66
  
                 
Nine months ended September 30, 2019:
  
 
 
 
  
 
 
 
Unvested at December 31, 2018
    
31,790
     $
14.06
  
Granted
    
9,675
     $
15.52
  
Vested
    
(14,328
 )   $
15.79
  
Unvested at September 30, 2019
    
27,137
     $
13.66