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Note 13 - Stock Compensation Plans (Tables)
3 Months Ended
Mar. 31, 2020
Notes Tables  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
   
Three Months Ended
 
   
March 31, 2020
 
   
Shares
   
Weighted Average Grant Date Fair Value
 
Unvested, beginning of year
   
10,393
    $
19.26
 
Granted
   
14,457
     
20.94
 
Vested
   
(8,992
)    
19.96
 
Forfeited
   
     
 
Unvested, end of period
   
15,858
    $
20.40