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Note 17 - Concentration of Third-party Mortgage Purchasers (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Year Ended December 31,
 
 
 
2016
 
 
2015
 
 
2014
 
Wells Fargo Funding, Inc.
 
 
26
%
 
 
10
%
 
 
37
%
PennyMac Loan Services, LLC
 
 
15
%
 
 
14
%
 
 
23
%
Fannie Mae
 
 
10
%
 
 
7
%
 
 
10
%
JP Morgan Chase Bank, N.A.
 
 
8
%
 
 
32
%
 
 
20
%