Note 2 - Investment Securities - Investment Securities Available for Sale (Details) $ in Thousands	Jun. 30, 2017 USD ($)
Number of investment positions - less than twelve months	121
Fair value - less than twelve months	$ 163,138
Gross unrealized losses - less than twelve months	$ 1,625
Number of investment positions - more than twelve months	25
Fair value - more than twelve months	$ 36,905
Gross unrealized losses - more than twelve months	$ 504
Number of investment positions	146
Fair value	$ 200,043
Gross unrealized losses	$ 2,129
US Government Agencies Debt Securities [Member]
Number of investment positions - less than twelve months	18
Fair value - less than twelve months	$ 50,419
Gross unrealized losses - less than twelve months	$ 242
Number of investment positions - more than twelve months	5
Fair value - more than twelve months	$ 18,805
Gross unrealized losses - more than twelve months	$ 195
Agency Collateralized Mortgage Obligations [Member]
Number of investment positions - less than twelve months	9
Fair value - less than twelve months	$ 7,385
Gross unrealized losses - less than twelve months	$ 79
Number of investment positions - more than twelve months	9
Fair value - more than twelve months	$ 5,735
Gross unrealized losses - more than twelve months	$ 98
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Number of investment positions - less than twelve months	69
Fair value - less than twelve months	$ 91,621
Gross unrealized losses - less than twelve months	$ 1,070
Number of investment positions - more than twelve months	5
Fair value - more than twelve months	$ 9,930
Gross unrealized losses - more than twelve months	$ 163
Municipal Notes [Member]
Number of investment positions - less than twelve months	25
Fair value - less than twelve months	$ 13,713
Gross unrealized losses - less than twelve months	$ 234
Municipal Bonds [Member]
Number of investment positions - more than twelve months	6
Fair value - more than twelve months	$ 2,435
Gross unrealized losses - more than twelve months	$ 48

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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