Note 8 - Summary of Repurchase Agreement (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Maturity Less than One Year [Member] | Collateralized Mortgage Backed Securities [Member]
Repurchase agreements	$ 20	$ 38
Maturity Less than One Year [Member]
Repurchase agreements	20	38
Maturity Less than One Year to Three Years [Member] | Collateralized Mortgage Backed Securities [Member]
Repurchase agreements		38
Maturity Less than One Year to Three Years [Member]
Repurchase agreements		38
Maturity over Three Years [Member] | Collateralized Mortgage Backed Securities [Member]
Repurchase agreements	40	40
Maturity over Three Years [Member]
Repurchase agreements	40	40
Collateralized Mortgage Backed Securities [Member]
Repurchase agreements	60	116
Repurchase agreements	$ 60	$ 116