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Note 7 - Share-based Compensation and Employee Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2019
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended March 31, 2019:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
Unvested at December 31, 2018
    
31,790
     $
14.06
  
Vested
    
(8,936
 )   $
15.07
  
Unvested at March 31, 2019
    
22,854
     $
13.66
  
                 
                 
Three months ended March 31, 2018:
  
 
 
 
  
 
 
 
Unvested at December 31, 2017
    
25,870
     $
12.15
  
Granted
    
14,199
     $
17.93
  
Vested
    
(2,935
 )   $
14.18
  
Forfeited
    
(100
 )   $
15.50
  
Unvested at March 31, 2018
    
37,034
     $
14.20