Note 11 - Derivatives and Risk Management Activities - Derivative Instrument Gain (Loss) Recorded in Statement of Income (Details) - Not Designated as Hedging Instrument [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Loan Advisory and Servicing Fees [Member] | Interest Rate Lock Commitments [Member]
Derivative Gain (Loss), Net	$ (454)
Loan Advisory and Servicing Fees [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Gain (Loss), Net	(26)
Loan Advisory and Servicing Fees [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Gain (Loss), Net
Other Operating Income (Expense) [Member] | Interest Rate Lock Commitments [Member]
Derivative Gain (Loss), Net	14
Other Operating Income (Expense) [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Gain (Loss), Net	11
Other Operating Income (Expense) [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Gain (Loss), Net	$ (294)