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Note 4 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Amortized cost, due within 5 years	$ 8,325
Amortized cost, due after 5 years through 10 years	19,797	16,700
Amortized cost, due after 10 years	13,405	9,130
Available-for-sale securities, amortized cost	41,527	25,830
Fair value, due within 5 years	8,314
Fair value, due after 5 years through 10 years	19,051	16,583
Fair value, due after 10 years	12,899	8,993
Available-for-sale securities	40,264	25,576
Available-for-sale securities	40,264	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	8,397	8,928
Fair value, due after 10 years	4,610	4,876
Available-for-sale securities	13,007	13,804
Available-for-sale securities	13,007	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	4,525	4,548
Fair value, due after 10 years
Available-for-sale securities	4,525	4,548
Available-for-sale securities	4,525	4,548
US Treasury Securities [Member]
Amortized cost, due within 5 years	1,497
Amortized cost, due after 5 years through 10 years
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	1,497
Fair value, due within 5 years	1,497
Fair value, due after 5 years through 10 years
Fair value, due after 10 years
Available-for-sale securities	1,497
Available-for-sale securities	1,497
Available-for-sale Securities with Single Maturity Dates [Member]
Amortized cost, due within 5 years	1,497
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	19,997	18,500
Fair value, due within 5 years	1,497
Fair value, due after 5 years through 10 years	12,922	13,476
Fair value, due after 10 years	4,610	4,876
Available-for-sale securities	19,029	18,352
Available-for-sale securities	19,029	18,352
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost, due within 5 years	6,828
Amortized cost, due after 5 years through 10 years	6,297	3,200
Amortized cost, due after 10 years	8,405	4,130
Available-for-sale securities, amortized cost	21,530	7,330
Fair value, due within 5 years	6,817
Fair value, due after 5 years through 10 years	6,129	3,107
Fair value, due after 10 years	8,289	4,117
Available-for-sale securities	21,235	7,224
Available-for-sale securities	$ 21,235	$ 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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