Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements $ in Thousands	Jun. 30, 2015 USD ($)
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	$ 128,627
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	128,627
Maturity Overnight [Member]
Note 9 - Securities Sold under Agreements to Repurchase (Details) - Maturity of Repurchase Agreements [Line Items]
Remaining contractual maturity of the agreements	25,959
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	25,959
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	1,200
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	1,200
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	713
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	713
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	100,755
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	$ 100,755