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Note 9 - Share-based Payments (Tables)
 12 Months Ended
Dec. 31, 2019
Notes Tables  
Share-based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
   
Number of Shares
    
Weighted Average Grant Date Fair Value (per share)
    
Aggregate Intrinsic Value (in thousands)
  
Non-vested December 31, 2018
    
7,210
     $
14.18
     $
102
  
Granted
    
10,858
     $
6.91
     $
75
  
Vested
    
7,210
     $
14.18
     $
102
  
Forfeitures
    
—
     $
—
     $
—
  
Non-vested December 31, 2019
    
10,858
     $
6.91
     $
75
  
   
Number of Shares
    
Weighted Average Grant Date Fair Value (per share)
    
Aggregate Intrinsic Value (in thousands)
  
Non-vested December 31, 2018
    
332,364
     $
14.34
     $
4,765
  
Granted
    
219,959
     $
6.91
     $
1,520
  
Vested
    
97,335
     $
14.42
     $
1,404
  
Forfeited
    
71,558
     $
10.67
     $
763
  
Non-vested December 31, 2019
    
383,430
     $
10.74
     $
4,118