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Note 2 - Investment Securities (Details) - USD ($)	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available-for-sale securities, amortized cost		$ 12,170,000	$ 13,625,000
Available-for-sale securities, gross unrealized losses		21,000
Available-for-sale securities, gross unrealized gains		(52,000)	(212,000)
Available-for-sale securities		12,139,000	13,413,000
Corporate Debt Securities [Member]
Available-for-sale securities, amortized cost		9,000,000	9,000,000
Available-for-sale securities, gross unrealized losses			71,000
Available-for-sale securities, gross unrealized gains		(102,000)	(61,000)
Available-for-sale securities		8,898,000	9,010,000
Subordinated Notes [Member]
Available-for-sale securities, amortized cost		2,000,000	2,000,000
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, gross unrealized gains
Available-for-sale securities		2,000,000	2,000,000
US Government Agencies Debt Securities [Member]
Available-for-sale securities, amortized cost			5,000,000
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, gross unrealized gains			(46,000)
Available-for-sale securities			4,954,000
Available-for-sale securities, amortized cost		23,170,000	29,625,000
Available-for-sale securities, gross unrealized losses		21,000	71,000
Available-for-sale securities, gross unrealized gains		(154,000)	(319,000)
Available-for-sale securities	$ 23,037,000	$ 23,037,000	$ 29,377,000

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562

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X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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