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Note 8 - Deposits (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Schedule of Maturities of Certificates of Deposit [Table Text Block]
Year ending December 31:
       
2018
  $
478,334,220
 
2019
   
86,231,955
 
2020
   
18,143,039
 
2021
   
8,223,919
 
2022
   
5,071,695
 
Thereafter
   
67,050
 
    $
596,071,878