Note 6 - Securities (Details) - Amortized Cost, Gross Unrealized Gains and Losses, and the Fair Value of the Company's Securities - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Available-for-sale:
Available for sale securities, amortized cost	$ 226,116	$ 217,264
Available for sale securities, gross unrealized holding gains	1,161	2,493
Available for sale securities, gross unrealized holding losses	738	768
Available for sale securities, fair value	226,539	218,989
US Government Agencies Debt Securities [Member]
Available-for-sale:
Available for sale securities, amortized cost	43,789	29,246
Available for sale securities, gross unrealized holding gains	213	77
Available for sale securities, gross unrealized holding losses	1	47
Available for sale securities, fair value	44,001	29,276
US States and Political Subdivisions Debt Securities [Member]
Available-for-sale:
Available for sale securities, amortized cost	36,189	23,132
Available for sale securities, gross unrealized holding gains	60	1,380
Available for sale securities, gross unrealized holding losses	294	3
Available for sale securities, fair value	35,955	24,509
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Residential Mortgage [Member]
Available-for-sale:
Available for sale securities, amortized cost	24,163	26,129
Available for sale securities, gross unrealized holding gains	237	103
Available for sale securities, gross unrealized holding losses	4	1
Available for sale securities, fair value	24,396	26,231
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Commercial Loan [Member]
Available-for-sale:
Available for sale securities, amortized cost	84,904	61,017
Available for sale securities, gross unrealized holding gains	201	492
Available for sale securities, gross unrealized holding losses	314	253
Available for sale securities, fair value	84,791	61,256
Residential Mortgage Backed Securities [Member]
Available-for-sale:
Available for sale securities, amortized cost	33,329	73,998
Available for sale securities, gross unrealized holding gains	446	441
Available for sale securities, gross unrealized holding losses	4	341
Available for sale securities, fair value	33,771	74,098
Corporate Debt Securities [Member]
Available-for-sale:
Available for sale securities, amortized cost	500	500
Available for sale securities, gross unrealized holding gains	0	0
Available for sale securities, gross unrealized holding losses	69	80
Available for sale securities, fair value	431	420
Negotiable Certificates of Deposit [Member]
Available-for-sale:
Available for sale securities, amortized cost	2,232	2,232
Available for sale securities, gross unrealized holding gains	4	0
Available for sale securities, gross unrealized holding losses	0	0
Available for sale securities, fair value	2,236	2,232
Equity Securities [Member]
Available-for-sale:
Available for sale securities, amortized cost	1,010	1,010
Available for sale securities, gross unrealized holding gains	0	0
Available for sale securities, gross unrealized holding losses	52	43
Available for sale securities, fair value	$ 958	$ 967