Note 4 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Real Estate Construction Portfolio Segment[Member]
Balance			$ 576,000	$ 612,000	$ 612,000
Charge-offs			(29,000)	0	0
Recoveries			0	0	0
Provision for loan losses			(43,000)	(77,000)	(36,000)
Balance	$ 504,000	$ 535,000	504,000	535,000	576,000
Consumer Real Estate Portfolio Segment [Member]
Balance			1,866,000	1,662,000	1,662,000
Charge-offs			(131,000)	(201,000)	(205,000)
Recoveries			2,000	1,000	2,000
Provision for loan losses			111,000	332,000	407,000
Balance	1,848,000	1,794,000	1,848,000	1,794,000	1,866,000
Commercial Real Estate Portfolio Segment [Member]
Balance			4,109,000	3,537,000	3,537,000
Charge-offs			(149,000)	(155,000)	(1,114,000)
Recoveries			71,000	36,000	49,000
Provision for loan losses			(525,000)	420,000	1,637,000
Balance	3,506,000	3,838,000	3,506,000	3,838,000	4,109,000
Commercial Non Real Estate Segment [Member]
Balance			655,000	1,475,000	1,475,000
Charge-offs			(767,000)	(453,000)	(490,000)
Recoveries			6,000	1,000	1,000
Provision for loan losses			1,493,000	(153,000)	(331,000)
Balance	1,387,000	870,000	1,387,000	870,000	655,000
Public Sector and IDA Portfolio Segment[Member]
Balance			436,000	327,000	327,000
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			(66,000)	170,000	109,000
Balance	370,000	497,000	370,000	497,000	436,000
Consumer Non Real Estate Portfolio Segment [Member]
Balance			627,000	602,000	602,000
Charge-offs			(191,000)	(193,000)	(311,000)
Recoveries			44,000	84,000	93,000
Provision for loan losses			152,000	21,000	243,000
Balance	632,000	514,000	632,000	514,000	627,000
Unallocated Financing Receivables [Member]
Balance			28,000	48,000	48,000
Charge-offs			0	0	0
Recoveries			0	0	0
Provision for loan losses			26,000	21,000	(20,000)
Balance	54,000	69,000	54,000	69,000	28,000
Balance			8,297,000	8,263,000	8,263,000
Charge-offs			(1,267,000)	(1,002,000)	(2,120,000)
Recoveries			123,000	122,000	145,000
Provision for loan losses	291,000	178,000	1,148,000	734,000	2,009,000
Balance	$ 8,301,000	$ 8,117,000	$ 8,301,000	$ 8,117,000	$ 8,297,000