Note 11 - Derivatives and Risk Management Activities - Amounts Recorded in Statement to Financial Condition (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Assets [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Asset, Fair Value	$ 3	$ 103
Derivative Asset, Notional Amount	2,467	8,586
Other Assets [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Asset, Fair Value	8	229
Derivative Asset, Notional Amount	2,500	18,373
Other Assets [Member] | Interest Rate Lock Commitments [Member]
Derivative Asset, Fair Value	831	439
Derivative Asset, Notional Amount	33,875	20,792
Other Liabilities [Member] | Best Efforts Forward Loan sales Commitments [Member]
Derivative Liability, Fair Value	270	125
Derivative Liability, Notional Amount	35,290	18,963
Other Liabilities [Member] | Mandatory Forward Loan Sales Commitments [Member]
Derivative Liability, Fair Value	125	38
Derivative Liability, Notional Amount	16,527	5,024
Other Liabilities [Member] | Interest Rate Lock Commitments [Member]
Derivative Liability, Fair Value	7	55
Derivative Liability, Notional Amount	$ 3,882	$ 6,757