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Note 15 - Share-based Compensation (Tables)
12 Months Ended
Dec. 31, 2021
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, 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 

Granted

  20,476  $10.48 

Vested

  (12,920) $12.95 

Forfeited

  (4,586) $9.39 

Unvested at December 31, 2021

  21,468  $6.48