Note 6 - Troubled Debt Restructurings (Details) - Roll Forward of TDR Loans - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Beginning balance		$ 4,600
Ending balance		2,400	$ 4,600
Performing Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		1,422	5,207
Additions	[1]	0	46
Charge-offs	[2]	(8)	0
Other	[3]	(537)	(3,831)
Ending balance		877	1,422
Performing Financial Instruments [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		0	287
Additions	[1]	0	0
Charge-offs	[2]	0	0
Other	[3]	0	(287)
Ending balance		0	0
Performing Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		1,141	4,662
Additions	[1]	0	0
Charge-offs	[2]	(8)	0
Other	[3]	(363)	(3,521)
Ending balance		770	1,141
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		281	258
Additions	[1]	0	46
Charge-offs	[2]	0	0
Other	[3]	(174)	(23)
Ending balance		107	281
Nonperforming Financial Instruments [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		3,240	3,560
Additions	[1]	0	1,459
Charge-offs	[2]	(195)	(554)
Other	[4]	(1,543)	(1,225)
Ending balance		1,502	3,240
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		834	859
Additions	[1]	0	0
Charge-offs	[2]	0	0
Other	[4]	(25)	(25)
Ending balance		809	834
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		2,355	2,650
Additions	[1]	0	1,459
Charge-offs	[2]	(162)	(554)
Other	[4]	(1,659)	(1,200)
Ending balance		534	2,355
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Modifications [Line Items]
Beginning balance		51	51
Additions	[1]	0	0
Charge-offs	[2]	(33)	0
Other	[4]	141	0
Ending balance		$ 159	$ 51

[1] Includes new TDRs and increases to existing TDRs.

[2] Post modification charge-offs.

[3] Includes principal payments, paydowns and performing loans previously restructured at market rates that are no longer reported as TDRs.

[4] Includes principal payments, paydowns and loans previously designated as non-performing that are now current and performing incompliance with their modified terms.