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Note 3 - Available-for-sale Securities - Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available-for-sale securities, amortized cost	$ 25,354	$ 25,830
Available-for-sale securities, gross unrealized gains	37	48
Available-for-sale securities, gross unrealized losses	(598)	(302)
Available-for-sale securities, at fair value	24,793	25,576
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, amortized cost	6,854	7,330
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(199)	(106)
Available-for-sale securities, at fair value	6,655	7,224
Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost	14,000	14,000
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(399)	(196)
Available-for-sale securities, at fair value	13,601	13,804
Subordinated Notes [Member]
Available-for-sale securities, amortized cost	4,500	4,500
Available-for-sale securities, gross unrealized gains	37	48
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, at fair value	$ 4,537	$ 4,548

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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