Note 8 - Repurchase Agreements (Details) - Repurchase Agreement $ in Thousands	Jun. 30, 2015 USD ($)
Repurchase agreements:
Repurchase agreements	$ 116,000
Collateralized Mortgage Backed Securities [Member]
Repurchase agreements:
Repurchase agreements	116,000
Maturity Less than One Year [Member]
Repurchase agreements:
Repurchase agreements	18,000
Maturity Less than One Year [Member] | Collateralized Mortgage Backed Securities [Member]
Repurchase agreements:
Repurchase agreements	18,000
Maturity Less than One Year to Three Years [Member]
Repurchase agreements:
Repurchase agreements	58,000
Maturity Less than One Year to Three Years [Member] | Collateralized Mortgage Backed Securities [Member]
Repurchase agreements:
Repurchase agreements	58,000
Maturity Over Three Years [Member]
Repurchase agreements:
Repurchase agreements	40,000
Maturity Over Three Years [Member] | Collateralized Mortgage Backed Securities [Member]
Repurchase agreements:
Repurchase agreements	$ 40,000