Note 7 - Loans and Allowance for Loan Losses - Allowance for Loan Losses and the Recorded Investment in Loans by Impairment Method (Details) - USD ($)	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Real Estate Portfolio Segment [Member]
Individually evaluated for impairment	$ 2,552,000		$ 2,515,000
Collectively evaluated for impairment	5,852,000		6,658,000
Total ending allowance balance	8,404,000	$ 8,709,000	9,173,000	$ 10,806,000	$ 11,522,000	$ 12,542,000
Loans individually evaluated for impairment	42,736,000		36,625,000
Loans collectively evaluated for impairment	815,647,000		820,411,000
Loans, net of unearned income	858,383,000		857,036,000
Commercial Portfolio Segment [Member]
Individually evaluated for impairment	211,000		223,000
Collectively evaluated for impairment	595,000		597,000
Total ending allowance balance	806,000	839,000	820,000	1,057,000	866,000	1,153,000
Loans individually evaluated for impairment	411,000		400,000
Loans collectively evaluated for impairment	88,994,000		89,420,000
Loans, net of unearned income	89,405,000		89,820,000
Consumer Portfolio Segment [Member]
Individually evaluated for impairment	151,000		156,000
Collectively evaluated for impairment	124,000		166,000
Total ending allowance balance	275,000	280,000	322,000	336,000	218,000	273,000
Loans individually evaluated for impairment	151,000		157,000
Loans collectively evaluated for impairment	9,487,000		12,262,000
Loans, net of unearned income	9,638,000		12,419,000
Individually evaluated for impairment	2,914,000		2,894,000
Collectively evaluated for impairment	6,571,000		7,421,000
Total ending allowance balance	9,485,000	$ 9,828,000	10,315,000	$ 12,199,000	$ 12,606,000	$ 13,968,000
Loans individually evaluated for impairment	43,298,000		37,182,000
Loans collectively evaluated for impairment	914,128,000		922,093,000
Loans, net of unearned income	$ 957,426,000		$ 959,275,000