Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements $ in Thousands	Dec. 31, 2015 USD ($)
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	$ 135,827
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	135,827
Maturity Overnight [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	33,151
Maturity Overnight [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	33,151
Maturity Less than 30 Days [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	1,202
Maturity Less than 30 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	1,202
Maturity 30 to 89 Days [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	0
Maturity 30 to 89 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	0
Maturity 90 Days to One Year [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	716
Maturity 90 Days to One Year [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	716
Maturity Over One Year to Four Years [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	100,758
Maturity Over One Year to Four Years [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Note 9 - Securities Sold Under Agreements to Repurchase and Other Long-term Borrowings (Details) - Maturity of Short and Long-Term Repurchase Agreements [Line Items]
Short and long-term purchase agreements	$ 100,758