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Note 6 - Share-based Compensation and Employee Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2018
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended March 31, 2018:
  
Number
of
Shares Awarded
    
Weighted Average
Grant Date
Fair Value
  
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
  
                 
Three months ended March 31, 2017:
  
 
 
 
  
 
 
 
Unvested at December 31, 2016
    
35,264
      
$12.84
  
Vested
    
(2,231
 )    
$13.03
  
Unvested at March 31, 2017
    
33,033
      
$12.55