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Note 3 - Investment Securities - Amortized Cost and Fair Value of Municipal Securities by State, Including Gross Unrealized Gains and Losses (Details) - US States and Political Subdivisions Debt Securities [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Percent of Municipal Portfolio	100.00%	100.00%
Municipal securities, amortized cost	$ 101,552	$ 111,659
Municipal securities, unrealized gains	2,203	2,258
Municipal securities, unrealized losses	(107)	(586)
Municipal securities, fair value	$ 103,648	$ 113,331
NEW YORK
Percent of Municipal Portfolio	10.64%	11.66%
Municipal securities, amortized cost	$ 10,804	$ 12,876
Municipal securities, unrealized gains	223	334
Municipal securities, unrealized losses
Municipal securities, fair value	$ 11,027	$ 13,210
Minnesota [Member]
Percent of Municipal Portfolio	10.12%	9.70%
Municipal securities, amortized cost	$ 10,280	$ 10,796
Municipal securities, unrealized gains	211	232
Municipal securities, unrealized losses	(1)	(40)
Municipal securities, fair value	$ 10,490	$ 10,988
WISCONSIN
Percent of Municipal Portfolio	8.74%	8.66%
Municipal securities, amortized cost	$ 8,913	$ 9,786
Municipal securities, unrealized gains	147	74
Municipal securities, unrealized losses		(42)
Municipal securities, fair value	$ 9,060	$ 9,818
Massachusetts [Member]
Percent of Municipal Portfolio	8.57%	8.45%
Municipal securities, amortized cost	$ 8,691	$ 9,355
Municipal securities, unrealized gains	208	229
Municipal securities, unrealized losses	(14)	(10)
Municipal securities, fair value	$ 8,885	$ 9,574
OHIO
Percent of Municipal Portfolio	8.36%	8.50%
Municipal securities, amortized cost	$ 8,551	$ 9,599
Municipal securities, unrealized gains	123	125
Municipal securities, unrealized losses	(13)	(88)
Municipal securities, fair value	$ 8,661	$ 9,636
TEXAS
Percent of Municipal Portfolio	7.23%	6.55%
Municipal securities, amortized cost	$ 7,388	$ 7,397
Municipal securities, unrealized gains	122	130
Municipal securities, unrealized losses	(21)	(103)
Municipal securities, fair value	$ 7,489	$ 7,424
NEW JERSEY
Percent of Municipal Portfolio	4.67%	7.14%
Municipal securities, amortized cost	$ 4,670	$ 7,891
Municipal securities, unrealized gains	167	202
Municipal securities, unrealized losses
Municipal securities, fair value	$ 4,837	$ 8,093
CONNECTICUT
Percent of Municipal Portfolio	6.82%	6.90%
Municipal securities, amortized cost	$ 6,929	$ 7,628
Municipal securities, unrealized gains	142	190
Municipal securities, unrealized losses
Municipal securities, fair value	$ 7,071	$ 7,818
IOWA
Percent of Municipal Portfolio	5.27%	5.66%
Municipal securities, amortized cost	$ 5,463	$ 6,467
Municipal securities, unrealized gains	30	36
Municipal securities, unrealized losses	(35)	(88)
Municipal securities, fair value	$ 5,458	$ 6,415
All Other States [Member]
Percent of Municipal Portfolio	29.59%	26.78%
Municipal securities, amortized cost	$ 29,863	$ 29,864
Municipal securities, unrealized gains	830	706
Municipal securities, unrealized losses	(23)	(215)
Municipal securities, fair value	$ 30,670	$ 30,355

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale and the amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale and the amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity.

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- Definition

The cost of debt and equity securities, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any and the amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Amount of investment in debt and equity securities categorized as available-for-sale and the fair value of investments in debt securities classified as held-to-maturity.

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