Note 10 - Other Borrowings and Subordinated Debentures (Details) - USD ($)	1 Months Ended	3 Months Ended
	Oct. 31, 2015	Sep. 30, 2015	Dec. 31, 2013	Dec. 31, 2014
Note 10 - Other Borrowings and Subordinated Debentures (Details) [Line Items]
Unsecured Debt		$ 41,466,000		$ 43,100,000
Federal Home Loan Bank, Advances, Maturities Summary, Due in Next Twelve Months		60,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Repayment and Penalties		23,200,000
Advances from Federal Home Loan Banks		132,000,000
Advances from Federal Home Loan Bank Available		1,100,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged		1,200,000,000
Subsequent Event [Member]
Note 10 - Other Borrowings and Subordinated Debentures (Details) [Line Items]
Repayments of Long-term Debt	$ 36,000,000
Federal Home Loan Bank Advances [Member]
Note 10 - Other Borrowings and Subordinated Debentures (Details) [Line Items]
Extinguishment of Debt, Amount		22,000,000
Payments of Debt Extinguishment Costs		1,300,000
Interest Expense [Member] | Federal Home Loan Bank Advances [Member]
Note 10 - Other Borrowings and Subordinated Debentures (Details) [Line Items]
Gains (Losses) on Extinguishment of Debt		$ (782,000)
Correspondent Banks [Member] | Subsequent Event [Member]
Note 10 - Other Borrowings and Subordinated Debentures (Details) [Line Items]
Debt Instrument, Term	10 years
Debt Instrument, Face Amount	$ 52,300,000
Debt Instrument, Interest Rate, Stated Percentage	3.58%
Metropolitan [Member]
Note 10 - Other Borrowings and Subordinated Debentures (Details) [Line Items]
Unsecured Debt			$ 46,000,000
Debt Instrument, Term			3 years