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Note 3 - Available-for-sale Securities - Investment Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized cost, due within 5 years	$ 11,159	$ 8,326
Amortized cost, due after 5 years through 10 years	17,344	19,168
Amortized cost, due after 10 years	12,901	13,116
Available-for-sale securities, amortized cost	41,404	40,610
Fair value, due within 5 years	11,155	8,329
Fair value, due after 5 years through 10 years	16,626	18,631
Fair value, due after 10 years	12,494	12,536
Fair value, total	40,275	39,496
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	8,278	8,537
Fair value, due after 10 years	4,550	4,437
Fair value, total	12,828	12,974
Subordinated Notes [Member]
Amortized cost, due within 5 years
Amortized cost, due after 5 years through 10 years	5,899	4,500
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	5,899	4,500
Fair value, due within 5 years
Fair value, due after 5 years through 10 years	5,980	4,564
Fair value, due after 10 years
Fair value, total	5,980	4,564
US Treasury Securities [Member]
Amortized cost, due within 5 years	1,488	1,484
Amortized cost, due after 5 years through 10 years
Amortized cost, due after 10 years
Available-for-sale securities, amortized cost	1,488	1,484
Fair value, due within 5 years	1,491	1,485
Fair value, due after 5 years through 10 years
Fair value, due after 10 years
Fair value, total	1,491	1,485
Available-for-sale Securities with Single Maturity Dates [Member]
Amortized cost, due within 5 years	1,488	1,484
Amortized cost, due after 5 years through 10 years	14,899	13,500
Amortized cost, due after 10 years	5,000	5,000
Available-for-sale securities, amortized cost	21,387	19,984
Fair value, due within 5 years	1,491	1,485
Fair value, due after 5 years through 10 years	14,258	13,101
Fair value, due after 10 years	4,550	4,437
Fair value, total	20,299	19,023
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Amortized cost, due within 5 years	9,671	6,842
Amortized cost, due after 5 years through 10 years	2,445	5,668
Amortized cost, due after 10 years	7,901	8,116
Available-for-sale securities, amortized cost	20,017	20,626
Fair value, due within 5 years	9,664	6,844
Fair value, due after 5 years through 10 years	2,368	5,530
Fair value, due after 10 years	7,944	8,099
Fair value, total	$ 19,976	$ 20,473

X

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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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