Note 12 - Regulatory Matters (Details) - USD ($) $ / shares in Units, $ in Millions									3 Months Ended		9 Months Ended
	Dec. 23, 2015	Oct. 15, 2015	Sep. 23, 2015	Jul. 16, 2015	Jun. 24, 2015	Apr. 16, 2015	Mar. 25, 2015	Jan. 15, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Jan. 30, 2015	Dec. 31, 2014	Dec. 31, 2009
Note 12 - Regulatory Matters (Details) [Line Items]
Trust Preferred Securities Included in Tier One Capital (in Dollars)									$ 52.9		$ 52.9			$ 52.4
Maximum Restricted Core Element Allowed in Tier One Capital, Percent											25.00%
Maximum Level of Consolidated Aggregate Assets Allowing for Inclusion of Trust Preferred Securities in Tier One Capital (in Dollars)															$ 15,000.0
Preferred Securities of Subsidiary Trust (in Dollars)									$ 52.9		$ 52.9			$ 52.4
Common Stock, Dividends, Per Share, Cash Paid			$ 0.15		$ 0.14		$ 0.14		$ 0.15	$ 0.12	$ 0.43	$ 2.36
Common Stock, Dividends, Per Share, Declared				$ 0.15		$ 0.14		$ 0.14
Stock Repurchase Program, Authorized Amount (in Dollars)													$ 20.0
Scenario, Forecast [Member]
Note 12 - Regulatory Matters (Details) [Line Items]
Common Stock, Dividends, Per Share, Cash Paid	$ 0.15
Repurchased Stock [Member]
Note 12 - Regulatory Matters (Details) [Line Items]
Stock Repurchased During Period, Shares (in Shares)											765,000
Share Price									$ 19.89		$ 19.89
Stock Repurchased During Period, Value (in Dollars)											$ 15.2
Subsequent Event [Member]
Note 12 - Regulatory Matters (Details) [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.15