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Note 18 - Concentration of Third-party Mortgage Purchasers (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]
   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
PennyMac Loan Services, LLC
    
23
 %    
17
 %    
15
 %
Fannie Mae
    
11
 %    
11
 %    
10
 %
U.S. Bancorp
    
11
 %    
9
 %    
7
 %
SunTrust Mortgage, Inc.
    
11
 %    
8
 %    
8
 %
Flagstar Bancorp, Inc.
    
11
 %    
6
 %    
0
 %
Wells Fargo Funding, Inc.
    
9
 %    
13
 %    
26
 %
Ginnie Mae
    
5
 %    
11
 %    
9
 %