Note 7 - Loans and Allowance for Loan Losses - Activity in the Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Real Estate Portfolio Segment [Member]
Balance, beginning of period	$ 8,709,000	$ 11,522,000	$ 9,173,000	$ 12,542,000
Provision for loan losses	(147,000)	(576,000)	(600,000)	(1,787,000)
Recoveries	50,000	52,000	102,000	338,000
Loans charged off	(208,000)	(192,000)	(271,000)	(287,000)
Balance, end of period	8,404,000	10,806,000	8,404,000	10,806,000
Commercial Portfolio Segment [Member]
Balance, beginning of period	839,000	866,000	820,000	1,153,000
Provision for loan losses	(4,000)	189,000	(10,000)	(101,000)
Recoveries	19,000	15,000	55,000	31,000
Loans charged off	(48,000)	(13,000)	(59,000)	(26,000)
Balance, end of period	806,000	1,057,000	806,000	1,057,000
Consumer Portfolio Segment [Member]
Balance, beginning of period	280,000	218,000	322,000	273,000
Provision for loan losses	(5,000)	123,000	(19,000)	79,000
Recoveries	11,000	26,000	43,000	63,000
Loans charged off	(11,000)	(31,000)	(71,000)	(79,000)
Balance, end of period	275,000	336,000	275,000	336,000
Balance, beginning of period	9,828,000	12,606,000	10,315,000	13,968,000
Provision for loan losses	(156,000)	(264,000)	(629,000)	(1,809,000)
Recoveries	80,000	93,000	200,000	432,000
Loans charged off	(267,000)	(236,000)	(401,000)	(392,000)
Balance, end of period	$ 9,485,000	$ 12,199,000	$ 9,485,000	$ 12,199,000