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Note 9 - Share-based Compensation and Employee Benefit Plan (Tables)
 3 Months Ended
Mar. 31, 2021
Notes Tables  
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
Three months ended March 31, 2021:
  
Number of

Shares Awarded
    
Weighted Average

Grant Date

Fair Value
  
Unvested at December 31, 2020
    
18,498
     $
7.29
  
Vested
    
(700
 )   $
17.85
  
Unvested at March 31, 2021
    
17,798
     $
6.88
  
                 
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