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Note 8 - Shareholders' Equity (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Class of Treasury Stock [Table Text Block]
Period
 
Total Number of 
Shares Purchased
   
Average Price 
Paid per Share
   
Total Number of 
Shares Purchased 
as Part of Publicly 
Announced Plans 
or Programs
 
Jan 2018
   
8,652
    $
8.57
     
8,652
 
February 2018
   
7,019
     
8.26
     
7,019
 
March 2018
   
1,878
     
8.02
     
1,878
 
Total
   
17,549
     
8.39
     
17,549