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Note 4 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Amortized cost, due within 5 years	$ 8,326
Amortized cost, due after 5 years through 10 years	19,168	16,700
Amortized cost, due after 10 years	13,116	9,130
Available-for-sale securities, amortized cost	40,610	25,830
Fair value, due within 5 years	8,329
Fair value, due after 5 years through 10 years	18,631	16,583
Fair value, due after 10 years	12,536	8,993
Available-for-sale securities	39,496	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	8,537	8,928
Fair value, due after 10 years	4,437	4,876
Available-for-sale securities	12,974	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	4,564	4,548
Fair value, due after 10 years
Available-for-sale securities	4,564	4,548
US Treasury Securities [Member]
Amortized cost, due within 5 years	1,484
Amortized cost, due after 5 years through 10 years
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	1,484
Fair value, due within 5 years	1,485
Fair value, due after 5 years through 10 years
Fair value, due after 10 years
Available-for-sale securities	1,485
Available-for-sale Securities with Single Maturity Dates [Member]
Amortized cost, due within 5 years	1,484
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	19,984	18,500
Fair value, due within 5 years	1,485
Fair value, due after 5 years through 10 years	13,101	13,476
Fair value, due after 10 years	4,437	4,876
Available-for-sale securities	19,023	18,352
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost, due within 5 years	6,842
Amortized cost, due after 5 years through 10 years	5,668	3,200
Amortized cost, due after 10 years	8,116	4,130
Available-for-sale securities, amortized cost	20,626	7,330
Fair value, due within 5 years	6,844
Fair value, due after 5 years through 10 years	5,530	3,107
Fair value, due after 10 years	8,099	4,117
Available-for-sale securities	$ 20,473	$ 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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