Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		$ 9,997	$ 9,525	$ 10,100	$ 9,317
Interest income	[1]	67	52	137	105
Real Estate Loan [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		9,610	9,095	9,712	8,880
Interest income	[1]	64	49	131	100
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		2,666	2,135	2,782	1,971
Interest income	[1]	31	21	64	37
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		6,601	6,658	6,584	6,606
Interest income	[1]	28	24	58	55
Construction, Land Acquisition and Development [Member] | Real Estate Loan [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		343	302	346	303
Interest income	[1]	5	4	9	8
Commercial Portfolio Segment [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		$ 30	$ 99	$ 30	$ 114
Interest income	[1]
Consumer Portfolio Segment [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Average balance		$ 357	$ 331	$ 358	$ 323
Interest income	[1]	$ 3	$ 3	$ 6	$ 5
State and Political Subdivisions [Member]
Note 4 - Loans (Details) - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans [Line Items]
Interest income	[1]

[1] Interest income represents income recognized on performing TDRs.