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Note 11 - Stock-based Compensation - Stock Options Exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Proceeds from stock options exercised		$ 328	$ 145
Fair value of shares received upon exercise of stock options	37	1,380	447
Tax benefit related to stock options exercised	39	185	99
Intrinsic value of stock options exercised	$ 96	$ 841	$ 330

X

- Definition

Disclosure of the aggregate tax benefit (expense) realized from the exercise of stock options and the conversion of similar instruments during the annual period.

+ References

No definition available.

+ Details

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X

- Definition

Value of stock issued as a result of the exercise of stock options, before deduction of related income tax (expense) benefit.

+ References

No definition available.

+ Details

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Namespace Prefix:	ffic_
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X

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=SL79508275-113901

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X

- Definition

Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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