Note 4 - Loans (Details) - Investment in Loans Modified as TDRs by Loan Category $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Troubled debt restructurings:
Number of contracts	4	5	7	12
Pre-modification outstanding recorded investments	$ 1,808	$ 233	$ 2,560	$ 789
Post-modification outstanding recorded investments	$ 1,825	$ 261	$ 2,577	$ 874
Residential Portfolio Segment [Member]
Troubled debt restructurings:
Number of contracts	3	4	5	6
Pre-modification outstanding recorded investments	$ 154	$ 186	$ 810	$ 369
Post-modification outstanding recorded investments	$ 171	$ 209	$ 827	$ 449
Commercial Real Estate Portfolio Segment [Member]
Troubled debt restructurings:
Number of contracts	1		1	4
Pre-modification outstanding recorded investments	$ 1,654		$ 1,654	$ 238
Post-modification outstanding recorded investments	$ 1,654		$ 1,654	$ 238
Construction, Land Acquisition and Development [Member]
Troubled debt restructurings:
Number of contracts			1
Pre-modification outstanding recorded investments			$ 96
Post-modification outstanding recorded investments			$ 96
Consumer Portfolio Segment [Member]
Troubled debt restructurings:
Number of contracts		1		2
Pre-modification outstanding recorded investments		$ 47		$ 182
Post-modification outstanding recorded investments		$ 52		$ 187