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Note 2 - Investment Debt Securities by Contractual Maturity (Details) - USD ($)	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
U.S. Government agency mortgage-backed securities, amortized cost		$ 12,170,000
U.S. Government agency mortgage-backed securities, fair value		12,139,000
Available-for-sale securities, amortized cost		12,170,000	$ 13,625,000
Available-for-sale securities		12,139,000	13,413,000
Due after five years through ten years, amortized cost		11,000,000
Due after five years through ten years, fair value		10,898,000
Available-for-sale securities, amortized cost		23,170,000	29,625,000
Available-for-sale securities	$ 23,037,000	$ 23,037,000	$ 29,377,000

X

- Definition

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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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of available-for-sale debt securities at cost, net of adjustments, that do not have a single maturity date and which the entity has decided to disclose separately rather than allocating the cost over several maturity groupings. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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