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Note 2 - Investment Securities (Details) - Investment Debt Securities by Contractual Maturity - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Maturity:
Due after five years through ten years	$ 16,000
Due after five years through ten years	15,886
Total	28,927	$ 29,625
Total	28,735	29,377
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Maturity:
U.S. Government agency mortgage-backed securities	12,927
U.S. Government agency mortgage-backed securities	12,849
Total	12,927	13,625
Total	$ 12,849	$ 13,413

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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