Note 3 - Loans and Allowance for Loan Losses (Details) - Loans by Credit Quality Indicators (USD $)	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 1,066,796,000	$ 1,053,243,000	$ 1,022,956,000
Commercial and Industrial [Member] | Grade 1 - 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	197,051,000	208,151,000
Commercial and Industrial [Member] | Grade 5 - 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	90,776,000	76,237,000
Commercial and Industrial [Member] | Grade 8 - 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,182,000	1,985,000
Commercial and Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	289,009,000	286,373,000
Vacant Land,Land Developement and Residential Construction [Member] | Grade 1 - 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	7,993,000	6,973,000
Vacant Land,Land Developement and Residential Construction [Member] | Grade 5 - 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	24,946,000	25,535,000
Vacant Land,Land Developement and Residential Construction [Member] | Grade 8 - 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	4,251,000	4,233,000
Vacant Land,Land Developement and Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	37,190,000	36,741,000
Real Estate-Owner Occupied [Member] | Grade 1 - 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	161,357,000	156,230,000
Real Estate-Owner Occupied [Member] | Grade 5 - 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	99,484,000	103,066,000
Real Estate-Owner Occupied [Member] | Grade 8 - 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	3,458,000	2,581,000
Real Estate-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	264,299,000	261,877,000
Real Estate-Non-Owner Occupied [Member] | Grade 1 - 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	232,226,000	219,325,000
Real Estate-Non-Owner Occupied [Member] | Grade 5 - 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	124,526,000	122,717,000
Real Estate-Non-Owner Occupied [Member] | Grade 8 - 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	21,282,000	22,024,000
Real Estate-Non-Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	378,034,000	364,066,000
Real Estate-Multi Family And Residential Rental [Member] | Grade 1 - 4 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	15,411,000	15,465,000
Real Estate-Multi Family And Residential Rental [Member] | Grade 5 - 7 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	19,167,000	19,469,000
Real Estate-Multi Family And Residential Rental [Member] | Grade 8 - 9 [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	1,108,000	2,705,000
Real Estate-Multi Family And Residential Rental [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 35,686,000	$ 37,639,000