Note 7 - Loans and Allowance for Loan Losses - Activity in the Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Real Estate Portfolio Segment [Member]
Balance, beginning of period	$ 8,404,000	$ 10,806,000	$ 9,173,000	$ 12,542,000
Provision for loan losses	(425,000)	(765,000)	(1,025,000)	(2,552,000)
Recoveries	31,000	38,000	133,000	376,000
Loans charged off	(88,000)	(151,000)	(359,000)	(438,000)
Balance, end of period	7,922,000	9,928,000	7,922,000	9,928,000
Commercial Portfolio Segment [Member]
Balance, beginning of period	806,000	1,057,000	820,000	1,153,000
Provision for loan losses	203,000	(136,000)	193,000	(237,000)
Recoveries	52,000	145,000	107,000	176,000
Loans charged off	(134,000)	(42,000)	(193,000)	(68,000)
Balance, end of period	927,000	1,024,000	927,000	1,024,000
Consumer Portfolio Segment [Member]
Balance, beginning of period	275,000	336,000	322,000	273,000
Provision for loan losses	32,000	3,000	13,000	82,000
Recoveries	9,000	28,000	52,000	91,000
Loans charged off	(19,000)	(42,000)	(90,000)	(121,000)
Balance, end of period	297,000	325,000	297,000	325,000
Balance, beginning of period	9,485,000	12,199,000	10,315,000	13,968,000
Provision for loan losses	(190,000)	(898,000)	(819,000)	(2,707,000)
Recoveries	92,000	211,000	292,000	643,000
Loans charged off	(241,000)	(235,000)	(642,000)	(627,000)
Balance, end of period	$ 9,146,000	$ 11,277,000	$ 9,146,000	$ 11,277,000