Note 8 - Loans and Allowance for Loan Losses - Risk Category of Consumer Loans by Class (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Loans, net of unearned income	$ 1,064,215	$ 1,035,263
Consumer Portfolio Segment [Member]
Loans, net of unearned income	7,262	7,915
Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Loans, net of unearned income	4,215	4,853
Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Loans, net of unearned income	3,047	3,062
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Loans, net of unearned income	4,215	4,853
Performing Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Loans, net of unearned income	2,776	2,766
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Secured [Member]
Loans, net of unearned income	0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Consumer Unsecured [Member]
Loans, net of unearned income	$ 271	$ 296