Note 10 - Securities Sold Under Agreements to Repurchase by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
US Treasuries and Government Agencies [Member] | Maturity Overnight and Continuous [Member]
Securities sold under agreements to repurchase	$ 8,388	$ 9,072
US Treasuries and Government Agencies [Member] | Maturity Less than 30 Days [Member]
Securities sold under agreements to repurchase
US Treasuries and Government Agencies [Member] | Maturity 30 to 90 Days [Member]
Securities sold under agreements to repurchase
US Treasuries and Government Agencies [Member] | Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase
US Treasuries and Government Agencies [Member]
Securities sold under agreements to repurchase	$ 8,388	$ 9,072
Residential Mortgage Backed Securities [Member] | Maturity Overnight and Continuous [Member]
Securities sold under agreements to repurchase	$ 602	$ 3,003
Residential Mortgage Backed Securities [Member] | Maturity Less than 30 Days [Member]
Securities sold under agreements to repurchase
Residential Mortgage Backed Securities [Member] | Maturity 30 to 90 Days [Member]
Securities sold under agreements to repurchase
Residential Mortgage Backed Securities [Member] | Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase
Residential Mortgage Backed Securities [Member]
Securities sold under agreements to repurchase	$ 602	$ 3,003
Maturity Overnight and Continuous [Member]
Securities sold under agreements to repurchase	$ 8,990	$ 12,075
Maturity Less than 30 Days [Member]
Securities sold under agreements to repurchase
Maturity 30 to 90 Days [Member]
Securities sold under agreements to repurchase
Maturity Greater than 90 Days [Member]
Securities sold under agreements to repurchase
Securities sold under agreements to repurchase	$ 8,990	$ 12,075