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Note 4 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	16,364	16,700
Amortized cost, due after 10 years	8,582	9,130
Available-for-sale securities, amortized cost	24,946	25,830
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	15,855	16,583
Fair value, due after 10 years	8,127	8,993
Fair value, total	23,982	25,576
Corporate Debt Securities [Member]
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	9,000	9,000
Amortized cost, due after 10 years	5,000	5,000
Available-for-sale securities, amortized cost	14,000	14,000
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	8,587	8,928
Fair value, due after 10 years	4,614	4,876
Fair value, total	13,201	13,804
Subordinated Notes [Member]
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	4,500	4,500
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	4,500	4,500
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	4,552	4,548
Fair value, due after 10 years
Fair value, total	4,552	4,548
Available-for-sale Securities with Single Maturity Dates [Member]
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	13,500	13,500
Amortized cost, due after 10 years	5,000	5,000
Available-for-sale securities, amortized cost	18,500	18,500
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	13,139	13,476
Fair value, due after 10 years	4,614	4,876
Fair value, total	17,753	18,352
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	2,864	3,200
Amortized cost, due after 10 years	3,582	4,130
Available-for-sale securities, amortized cost	6,446	7,330
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	2,716	3,107
Fair value, due after 10 years	3,513	4,117
Fair value, total	$ 6,229	$ 7,224

X

- Definition

Amount after adjustments of available-for-sale debt securities at cost, maturing in the first fiscal year through the fifth 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 first fiscal year through the fifth 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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