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Note 4 - Loans - Secured Loans in Nonaccrual Status (Detail)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
MortgageLoan
Dec. 31, 2015
USD ($)
MortgageLoan
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Loans Details Secured Loans In Nonaccrual Status [Line Items]        
Number of loans | MortgageLoan 57 53    
Loans - principal (in Dollars) $ 83,385 $ 62,740 $ 46,721 $ 71,017
Accrued interest $ 614 $ 372    
Nonaccrual Status [Member]        
Loans Details Secured Loans In Nonaccrual Status [Line Items]        
Number of loans | MortgageLoan 1 2    
Loans - principal (in Dollars) $ 234 $ 623    
Accrued interest 2 14    
Principal [Member] | Nonaccrual Status [Member]        
Loans Details Secured Loans In Nonaccrual Status [Line Items]        
Loans - principal (in Dollars) 230 577    
Advances [Member] | Nonaccrual Status [Member]        
Loans Details Secured Loans In Nonaccrual Status [Line Items]        
Loans - principal (in Dollars) $ 2 $ 32