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Note 10 - Fair Value and Interest Rate Risk - Financial Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
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, at fair value	6,655	7,224
Corporate Debt Securities [Member]
Available-for-sale securities, at fair value	13,601	13,804
Subordinated Notes [Member]
Available-for-sale securities, at fair value	4,537	4,548
Fair Value, Measurements, Recurring [Member]
Available-for-sale securities, at fair value	24,793	25,576
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, at fair value	6,655	7,224
Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities, at fair value	13,601	13,804
Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities, at fair value	4,537	4,548
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities, at fair value	24,793	25,576
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, at fair value	6,655	7,224
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities, at fair value	13,601	13,804
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities, at fair value	4,537	4,548
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Corporate Debt Securities [Member]
Available-for-sale securities, at fair value
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member] | Subordinated Notes [Member]
Available-for-sale securities, at fair value

X

- 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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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