Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements $ in Thousands	Sep. 30, 2015 USD ($)
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	$ 136,027
US Government Agencies Debt Securities [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	136,027
Maturity Overnight [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	33,357
Maturity Overnight [Member] | US Government Agencies Debt Securities [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	33,357
Maturity Less than 30 Days [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	200
Maturity Less than 30 Days [Member] | US Government Agencies Debt Securities [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	200
Maturity 30 to 90 Days [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	0
Maturity 30 to 90 Days [Member] | US Government Agencies Debt Securities [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	0
Maturity Greater than 90 Days [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	1,714
Maturity Greater than 90 Days [Member] | US Government Agencies Debt Securities [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	1,714
Maturity Over One Year to Four Years [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	100,756
Maturity Over One Year to Four Years [Member] | US Government Agencies Debt Securities [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	$ 100,756