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Note 4 - Available-for-sale Securities - Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Available-for-sale securities, amortized cost	$ 41,527	$ 25,830
Available-for-sale securities, gross unrealized gains	26	48
Available-for-sale securities, gross unrealized losses	(1,289)	(302)
Available-for-sale securities	40,264	25,576
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, amortized cost	21,530	7,330
Available-for-sale securities, gross unrealized gains	1
Available-for-sale securities, gross unrealized losses	(296)	(106)
Available-for-sale securities	21,235	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	(993)	(196)
Available-for-sale securities	13,007	13,804
Subordinated Notes [Member]
Available-for-sale securities, amortized cost	4,500	4,500
Available-for-sale securities, gross unrealized gains	25	48
Available-for-sale securities, gross unrealized losses
Available-for-sale securities	4,525	$ 4,548
US Treasury Securities [Member]
Available-for-sale securities, amortized cost	1,497
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses
Available-for-sale securities	$ 1,497

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)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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X

- 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

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 (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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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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- Definition

Amount 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 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

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