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Note 1 - Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
US Government Agencies Debt Securities [Member]
Amortized Cost	$ 26,557	$ 20,307
Accrued Interest	$ 88	$ 22
Gross Unrealized Gains
Gross Unrealized Losses	$ (99)	$ (23)
Estimated Fair Value	26,546	20,306
Corporate Debt Securities [Member]
Amortized Cost	21,820	27,152
Accrued Interest	$ 184	151
Gross Unrealized Gains		5
Gross Unrealized Losses	$ (41)	(47)
Estimated Fair Value	21,963	27,261
Certificates of Deposit [Member]
Amortized Cost	21,884
Accrued Interest	21
Gross Unrealized Gains	5
Gross Unrealized Losses	(72)
Estimated Fair Value	21,838
Commercial Paper [Member]
Amortized Cost		11,838
Accrued Interest		$ 6
Gross Unrealized Gains
Gross Unrealized Losses		$ (63)
Estimated Fair Value		11,781
Amortized Cost	70,261	59,297
Accrued Interest	293	179
Gross Unrealized Gains	5	5
Gross Unrealized Losses	(212)	(133)
Estimated Fair Value	$ 70,347	$ 59,348

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- Definition

Represents available for sale securities accrued interest.

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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)
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-Name Accounting Standards Codification
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=27724398&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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-Publisher FASB
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-Section 50
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-Subparagraph (c)
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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)
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