Note 4 - Securities - Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Securities held-to-maturity, at amortized cost	$ 31,329	$ 31,187
Securities held-to-maturity	32,549
Securities available-for-sale securities, at amortized costs	208,927	176,518
Securities available-for-sale securities, gross unrealized gains	1,906	1,164
Securities available-for-sale securities, gross unrealized losses	(1,224)	(2,508)
Securities available-for-sale, at fair value	209,609	175,174
US Government Agencies Debt Securities [Member]
Securities available-for-sale securities, at amortized costs	24,220	10,427
Securities available-for-sale securities, gross unrealized gains	70	10
Securities available-for-sale securities, gross unrealized losses	(59)	(83)
Securities available-for-sale, at fair value	24,231	10,354
US States and Political Subdivisions Debt Securities [Member]
Securities held-to-maturity, at amortized cost	31,329	31,187
Securities held-to-maturity securities, gross unrealized gains	1,287	710
Securities held-to-maturity securities, gross unrealized losses	(67)	(523)
Securities held-to-maturity	32,549	31,374
Securities available-for-sale securities, at amortized costs	57,076	58,847
Securities available-for-sale securities, gross unrealized gains	1,430	1,001
Securities available-for-sale securities, gross unrealized losses	(106)	(420)
Securities available-for-sale, at fair value	58,400	59,428
Residential Mortgage Backed Securities and Collateralized Mortgage Obligations [Member]
Securities available-for-sale securities, at amortized costs	91,842	71,068
Securities available-for-sale securities, gross unrealized gains	244	33
Securities available-for-sale securities, gross unrealized losses	(711)	(1,497)
Securities available-for-sale, at fair value	91,375	69,604
Corporate Debt Securities [Member]
Securities available-for-sale securities, at amortized costs	8,268	16,153
Securities available-for-sale securities, gross unrealized gains	132	103
Securities available-for-sale securities, gross unrealized losses	(88)	(140)
Securities available-for-sale, at fair value	8,312	16,116
Commercial Mortgage Backed Securities [Member]
Securities available-for-sale securities, at amortized costs	23,584	15,786
Securities available-for-sale securities, gross unrealized gains	22	9
Securities available-for-sale securities, gross unrealized losses	(185)	(281)
Securities available-for-sale, at fair value	23,421	15,514
Asset-backed Securities [Member]
Securities available-for-sale securities, at amortized costs	3,937	4,237
Securities available-for-sale securities, gross unrealized gains	8	8
Securities available-for-sale securities, gross unrealized losses	(75)	(87)
Securities available-for-sale, at fair value	$ 3,870	$ 4,158