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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
US Government Agencies Debt Securities [Member]
Amortized Cost	$ 21,666	$ 26,557
Accrued Interest	53	$ 88
Gross Unrealized Gains	15
Gross Unrealized Losses	(6)	$ (99)
Estimated Fair Value	21,728	26,546
Corporate Debt Securities [Member]
Amortized Cost	20,718	21,820
Accrued Interest	94	$ 184
Gross Unrealized Gains	23
Gross Unrealized Losses	(3)	$ (41)
Estimated Fair Value	20,832	21,963
Certificates of Deposit [Member]
Amortized Cost	21,438	21,884
Accrued Interest	32	21
Gross Unrealized Gains	26	5
Gross Unrealized Losses	(8)	(72)
Estimated Fair Value	21,488	21,838
Amortized Cost	63,822	70,261
Accrued Interest	179	293
Gross Unrealized Gains	64	5
Gross Unrealized Losses	(17)	(212)
Estimated Fair Value	$ 64,048	$ 70,347

X

- Definition

Represents available for sale securities accrued interest.

+ References

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- 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
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-Section 50
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-Topic 320
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-Section 45
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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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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section 50
-Paragraph 2
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+ 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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