Note 7 - Loans And Related Allowance For Loan Losses (Details) - Allowance for Loan Losses (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Ending allowance balance attributable to loans:
Individually evaluated for impairment	$ 2,370,000		$ 2,370,000			$ 3,688,000
Collectively evaluated for impairment	5,378,000		5,378,000			4,091,000
Allowance balance	7,749,000	7,752,000	7,749,000	7,752,000		7,779,000
Commercial and Industrial [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	323,000		323,000			1,189,000
Collectively evaluated for impairment	552,000		552,000			543,000
Allowance balance	875,000	1,626,000	875,000	1,626,000		1,700,000
Commercial and Industrial [Member] | End of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance	875,000	1,626,000	875,000	1,626,000	875,000	1,732,000
Commercial and Industrial [Member] | Beginning of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance					1,229,000	1,732,000	1,510,000	1,296,000
Charge-offs	0	(28,000)	(325,000)	(29,000)
Recoveries	92,000	67,000	92,000	70,000
Provision	(446,000)	77,000	(624,000)	289,000
Real Estate Construction [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	814,000		814,000			933,000
Collectively evaluated for impairment	377,000		377,000			190,000
Allowance balance		504,000		504,000
Real Estate Construction [Member] | End of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance	1,191,000	504,000	1,191,000	504,000	1,192,000	1,123,000
Real Estate Construction [Member] | Beginning of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance					1,047,000	1,123,000	504,000	438,000
Charge-offs	(129,000)	0	(190,000)	0
Recoveries	0	0	33,000	0
Provision	273,000	0	226,000	66,000
Residential Real Estate Mortgage [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	754,000		754,000			600,000
Collectively evaluated for impairment	2,872,000		2,872,000			2,272,000
Allowance balance	3,600,000	4,109,000	3,600,000	4,109,000		2,900,000
Residential Real Estate Mortgage [Member] | End of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance	3,626,000	4,109,000	3,626,000	4,109,000	3,626,000	2,872,000
Residential Real Estate Mortgage [Member] | Beginning of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance					3,207,000	2,872,000	3,868,000	3,731,000
Charge-offs	(279,000)	0	(345,000)	(98,000)
Recoveries	47,000	0	71,000	3,000
Provision	651,000	241,000	1,028,000	473,000
Commercial Real Estate Mortgage [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	479,000		479,000			960,000
Collectively evaluated for impairment	1,526,000		1,526,000			1,031,000
Allowance balance		1,492,000		1,492,000
Commercial Real Estate Mortgage [Member] | End of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance	2,005,000	1,492,000	2,005,000	1,492,000	2,005,000	1,991,000
Commercial Real Estate Mortgage [Member] | Beginning of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance					2,201,000	1,991,000	1,360,000	1,306,000
Charge-offs	0	0	0	(53,000)
Recoveries	0	0	46,000	0
Provision	(196,000)	132,000	(32,000)	239,000
Consumer Installment [Member]
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0			6,000
Collectively evaluated for impairment	51,000		51,000			55,000
Allowance balance		21,000		21,000
Consumer Installment [Member] | End of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance	51,000	21,000	51,000	21,000	51,000	61,000
Consumer Installment [Member] | Beginning of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance					47,000	61,000	25,000	48,000
Charge-offs	(19,000)	(8,000)	(36,000)	(22,000)
Recoveries	5,000	4,000	11,000	12,000
Provision	18,000		15,000	(17,000)
End of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance	7,748,000	7,752,000	7,748,000	7,752,000	7,749,000	7,779,000
Beginning of Period [Member]
Ending allowance balance attributable to loans:
Allowance balance					7,731,000	7,779,000	7,267,000	6,819,000
Charge-offs	(427,000)	(36,000)	(896,000)	(202,000)
Recoveries	144,000	71,000	253,000	85,000
Provision	$ 300,000	$ 450,000	$ 613,000	$ 1,050,000