Note 12 - Borrowings (Details) - Borrowings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Retail Purchase Agreements [Member]
Retail repurchase agreements
Amount outstanding at year-end	$ 15,921	$ 18,175	$ 15,357
Average amount outstanding during year	20,054	18,916	20,485
Maximum amount outstanding at any month-end	31,418	24,640	27,985
Rate paid at year-end	0.01%	0.01%	0.01%
Weighted average rate paid during the year	0.01%	0.01%	0.01%
Federal Home Loan Bank Advances [Member]
Retail repurchase agreements
Amount outstanding at year-end	35,000	35,000
Average amount outstanding during year	12,205	425	1
Maximum amount outstanding at any month-end	40,000	35,000
Rate paid at year-end	0.24%	0.17%
Weighted average rate paid during the year	0.22%	0.24%
Other Short-term Borrowings [Member]
Retail repurchase agreements
Average amount outstanding during year	$ 16	$ 159	$ 30