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Note 15 - Share-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2020
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   
Number

of

Shares Awarded
    
Weighted Average

Grant Date

Fair Value
  
Unvested at December 31, 2017
    
25,870
     $
12.15
  
Granted
    
18,323
     $
18.07
  
Vested
    
(10,999
 )   $
16.21
  
Forfeited
    
(1,404
 )   $
14.44
  
Unvested at December 31, 2018
    
31,790
     $
14.06
  
Granted
    
9,675
     $
15.52
  
Vested
    
(19,995
 )   $
15.99
  
Unvested at December 31, 2019
    
21,470
     $
12.91
  
Granted
    
12,484
     $
6.12
  
Vested
    
(12,903
 )   $
13.82
  
Forfeited
    
(2,553
 )   $
15.86
  
Unvested at December 31, 2020
    
18,498
     $
7.29