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Note 9 - Share-based Compensation and Employee Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2020
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
 
  
Number of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Three months ended March 31, 2020:
                
Unvested at December 31, 2019
    
21,470
     $
12.91
  
Vested
    
(2,172
 )   $
14.56
  
Unvested at March 31, 2020
    
19,298
     $
12.73
  
                 
Three months ended March 31, 2019:
  
 
 
 
  
 
 
 
Unvested at December 31, 2018
    
31,790
     $
14.06
  
Vested
    
(8,936
 )   $
15.07
  
Unvested at March 31, 2019
    
22,854
     $
13.66